diff --git a/code/__DEFINES/flags.dm b/code/__DEFINES/flags.dm
index 5caa6ceec96..055ff7fb2e2 100644
--- a/code/__DEFINES/flags.dm
+++ b/code/__DEFINES/flags.dm
@@ -23,13 +23,13 @@
 #define MASKCOVERSMOUTH		2048		// on other items, these are just for mask/head
 #define HEADCOVERSMOUTH		2048
 
-#define THICKMATERIAL 1024		//prevents syringes, parapens and hypos if the external suit or helmet (if targeting head) has this flag. Example: space suits, biosuit, bombsuits, thick suits that cover your body. (NOTE: flag shared with NOSLIP for shoes)
 #define NOSLIP		1024 		//prevents from slipping on wet floors, in space etc (NOTE: flag shared with THICKMATERIAL for external suits and helmet)
 
 #define OPENCONTAINER	4096	// is an open container for chemistry purposes
 
-#define BLOCK_GAS_SMOKE_EFFECT 8192	// blocks the effect that chemical clouds would have on a mob --glasses, mask and helmets ONLY! (NOTE: flag shared with ONESIZEFITSALL)
-#define ONESIZEFITSALL	8192	// can be worn by fatties (or children? ugh) --jumpsuit only (NOTE: flag shared with BLOCK_GAS_SMOKE_EFFECT)
+// BLOCK_GAS_SMOKE_EFFECT only used in masks at the moment.
+#define BLOCK_GAS_SMOKE_EFFECT 8192	// blocks the effect that chemical clouds would have on a mob --glasses, mask and helmets ONLY! (NOTE: flag shared with THICKMATERIAL)
+#define THICKMATERIAL 8192		//prevents syringes, parapens and hypos if the external suit or helmet (if targeting head) has this flag. Example: space suits, biosuit, bombsuits, thick suits that cover your body. (NOTE: flag shared with BLOCK_GAS_SMOKE_EFFECT)
 
 #define	NOREACT		16384 		//Reagents dont' react inside this container.
 
diff --git a/code/game/gamemodes/cult/cult_items.dm b/code/game/gamemodes/cult/cult_items.dm
index 606d63aa994..6da4a22f51f 100644
--- a/code/game/gamemodes/cult/cult_items.dm
+++ b/code/game/gamemodes/cult/cult_items.dm
@@ -55,7 +55,7 @@
 	desc = "A set of armored robes worn by the followers of Nar-Sie"
 	icon_state = "cultrobes"
 	item_state = "cultrobes"
-	flags = FPRINT | TABLEPASS | ONESIZEFITSALL
+	flags = FPRINT | TABLEPASS
 	body_parts_covered = CHEST|GROIN|LEGS|ARMS
 	allowed = list(/obj/item/weapon/tome,/obj/item/weapon/melee/cultblade)
 	armor = list(melee = 50, bullet = 30, laser = 50,energy = 20, bomb = 25, bio = 10, rad = 0)
@@ -79,7 +79,7 @@
 	desc = "A set of armored robes worn by the followers of Nar-Sie"
 	icon_state = "magusred"
 	item_state = "magusred"
-	flags = FPRINT | TABLEPASS | ONESIZEFITSALL
+	flags = FPRINT | TABLEPASS
 	body_parts_covered = CHEST|GROIN|LEGS|ARMS
 	allowed = list(/obj/item/weapon/tome,/obj/item/weapon/melee/cultblade)
 	armor = list(melee = 50, bullet = 30, laser = 50,energy = 20, bomb = 25, bio = 10, rad = 0)
diff --git a/code/modules/clothing/clothing.dm b/code/modules/clothing/clothing.dm
index d36384cf683..efd13e599e0 100644
--- a/code/modules/clothing/clothing.dm
+++ b/code/modules/clothing/clothing.dm
@@ -91,7 +91,7 @@ BLIND     // can't see anything
 	icon = 'icons/obj/clothing/suits.dmi'
 	name = "suit"
 	var/fire_resist = T0C+100
-	flags = FPRINT | TABLEPASS | ONESIZEFITSALL
+	flags = FPRINT | TABLEPASS
 	allowed = list(/obj/item/weapon/tank/emergency_oxygen)
 	armor = list(melee = 0, bullet = 0, laser = 0,energy = 0, bomb = 0, bio = 0, rad = 0)
 	slot_flags = SLOT_OCLOTHING
diff --git a/code/modules/clothing/spacesuits/miscellaneous.dm b/code/modules/clothing/spacesuits/miscellaneous.dm
index f9fcf1b2747..500909e8675 100644
--- a/code/modules/clothing/spacesuits/miscellaneous.dm
+++ b/code/modules/clothing/spacesuits/miscellaneous.dm
@@ -67,7 +67,7 @@
 	icon_state = "santa"
 	item_state = "santa"
 	slowdown = 0
-	flags = FPRINT | TABLEPASS | ONESIZEFITSALL | STOPSPRESSUREDMAGE
+	flags = FPRINT | TABLEPASS | STOPSPRESSUREDMAGE
 	allowed = list(/obj/item) //for stuffing exta special presents
 
 
diff --git a/code/modules/clothing/suits/armor.dm b/code/modules/clothing/suits/armor.dm
index 8f513a82ed9..8f4e11a8005 100644
--- a/code/modules/clothing/suits/armor.dm
+++ b/code/modules/clothing/suits/armor.dm
@@ -16,7 +16,7 @@
 	icon_state = "armor"
 	item_state = "armor"
 	blood_overlay_type = "armor"
-	flags = FPRINT | TABLEPASS | ONESIZEFITSALL
+	flags = FPRINT | TABLEPASS
 	armor = list(melee = 50, bullet = 15, laser = 50, energy = 10, bomb = 25, bio = 0, rad = 0)
 
 /obj/item/clothing/suit/armor/hos
@@ -130,7 +130,7 @@
 	item_state = "reactiveoff"
 	blood_overlay_type = "armor"
 	slowdown = 1
-	flags = FPRINT | TABLEPASS | ONESIZEFITSALL
+	flags = FPRINT | TABLEPASS
 	armor = list(melee = 0, bullet = 0, laser = 0, energy = 0, bomb = 0, bio = 0, rad = 0)
 
 /obj/item/clothing/suit/armor/reactive/IsShield()
diff --git a/code/modules/clothing/suits/miscellaneous.dm b/code/modules/clothing/suits/miscellaneous.dm
index 3adb01fbcb6..474ae29f5b5 100644
--- a/code/modules/clothing/suits/miscellaneous.dm
+++ b/code/modules/clothing/suits/miscellaneous.dm
@@ -86,7 +86,7 @@
 	desc = "This robe commands authority."
 	icon_state = "judge"
 	item_state = "judge"
-	flags = FPRINT | TABLEPASS | ONESIZEFITSALL
+	flags = FPRINT | TABLEPASS
 	body_parts_covered = CHEST|GROIN|LEGS|ARMS
 	allowed = list(/obj/item/weapon/storage/fancy/cigarettes,/obj/item/weapon/spacecash)
 	flags_inv = HIDEJUMPSUIT
diff --git a/code/modules/clothing/suits/utility.dm b/code/modules/clothing/suits/utility.dm
index 7d0e41193b3..ff1e72895db 100644
--- a/code/modules/clothing/suits/utility.dm
+++ b/code/modules/clothing/suits/utility.dm
@@ -21,7 +21,7 @@
 	allowed = list(/obj/item/device/flashlight,/obj/item/weapon/tank/emergency_oxygen,/obj/item/weapon/extinguisher)
 	slowdown = 1.0
 	flags_inv = HIDEGLOVES|HIDESHOES|HIDEJUMPSUIT
-	flags = FPRINT | TABLEPASS | ONESIZEFITSALL | STOPSPRESSUREDMAGE | THICKMATERIAL
+	flags = FPRINT | TABLEPASS | STOPSPRESSUREDMAGE | THICKMATERIAL
 	heat_protection = CHEST|GROIN|LEGS|FEET|ARMS|HANDS
 	max_heat_protection_temperature = FIRE_SUIT_MAX_TEMP_PROTECT
 	cold_protection = CHEST|GROIN|LEGS|FEET|ARMS|HANDS
diff --git a/code/modules/clothing/under/color.dm b/code/modules/clothing/under/color.dm
index 67684deccc1..4279c637137 100644
--- a/code/modules/clothing/under/color.dm
+++ b/code/modules/clothing/under/color.dm
@@ -3,7 +3,7 @@
 	icon_state = "black"
 	item_state = "bl_suit"
 	item_color = "black"
-	flags = FPRINT | TABLEPASS | ONESIZEFITSALL
+	flags = FPRINT | TABLEPASS
 
 /obj/item/clothing/under/color/blackf
 	name = "feminine black jumpsuit"
@@ -18,21 +18,21 @@
 	icon_state = "blue"
 	item_state = "b_suit"
 	item_color = "blue"
-	flags = FPRINT | TABLEPASS | ONESIZEFITSALL
+	flags = FPRINT | TABLEPASS
 
 /obj/item/clothing/under/color/green
 	name = "green jumpsuit"
 	icon_state = "green"
 	item_state = "g_suit"
 	item_color = "green"
-	flags = FPRINT | TABLEPASS | ONESIZEFITSALL
+	flags = FPRINT | TABLEPASS
 
 /obj/item/clothing/under/color/grey
 	name = "grey jumpsuit"
 	icon_state = "grey"
 	item_state = "gy_suit"
 	item_color = "grey"
-	flags = FPRINT | TABLEPASS | ONESIZEFITSALL
+	flags = FPRINT | TABLEPASS
 
 /obj/item/clothing/under/color/orange
 	name = "orange jumpsuit"
@@ -42,35 +42,35 @@
 	item_color = "orange"
 	has_sensor = 2
 	sensor_mode = 3
-	flags = FPRINT | TABLEPASS | ONESIZEFITSALL
+	flags = FPRINT | TABLEPASS
 
 /obj/item/clothing/under/color/pink
 	name = "pink jumpsuit"
 	icon_state = "pink"
 	item_state = "p_suit"
 	item_color = "pink"
-	flags = FPRINT | TABLEPASS | ONESIZEFITSALL
+	flags = FPRINT | TABLEPASS
 
 /obj/item/clothing/under/color/red
 	name = "red jumpsuit"
 	icon_state = "red"
 	item_state = "r_suit"
 	item_color = "red"
-	flags = FPRINT | TABLEPASS | ONESIZEFITSALL
+	flags = FPRINT | TABLEPASS
 
 /obj/item/clothing/under/color/white
 	name = "white jumpsuit"
 	icon_state = "white"
 	item_state = "w_suit"
 	item_color = "white"
-	flags = FPRINT | TABLEPASS | ONESIZEFITSALL
+	flags = FPRINT | TABLEPASS
 
 /obj/item/clothing/under/color/yellow
 	name = "yellow jumpsuit"
 	icon_state = "yellow"
 	item_state = "y_suit"
 	item_color = "yellow"
-	flags = FPRINT | TABLEPASS | ONESIZEFITSALL
+	flags = FPRINT | TABLEPASS
 
 /obj/item/clothing/under/psyche
 	name = "psychedelic"
@@ -89,7 +89,7 @@
 	desc = "aqua"
 	icon_state = "aqua"
 	item_color = "aqua"
-	flags = FPRINT | TABLEPASS | ONESIZEFITSALL
+	flags = FPRINT | TABLEPASS
 
 /obj/item/clothing/under/purple
 	name = "purple"
@@ -121,14 +121,14 @@
 	desc = "lightbrown"
 	icon_state = "lightbrown"
 	item_color = "lightbrown"
-	flags = FPRINT | TABLEPASS | ONESIZEFITSALL
+	flags = FPRINT | TABLEPASS
 
 /obj/item/clothing/under/brown
 	name = "brown"
 	desc = "brown"
 	icon_state = "brown"
 	item_color = "brown"
-	flags = FPRINT | TABLEPASS | ONESIZEFITSALL
+	flags = FPRINT | TABLEPASS
 
 /obj/item/clothing/under/yellowgreen
 	name = "yellowgreen"
@@ -141,7 +141,7 @@
 	desc = "darkblue"
 	icon_state = "darkblue"
 	item_color = "darkblue"
-	flags = FPRINT | TABLEPASS | ONESIZEFITSALL
+	flags = FPRINT | TABLEPASS
 
 /obj/item/clothing/under/lightred
 	name = "lightred"
@@ -154,4 +154,4 @@
 	desc = "darkred"
 	icon_state = "darkred"
 	item_color = "darkred"
-	flags = FPRINT | TABLEPASS | ONESIZEFITSALL
\ No newline at end of file
+	flags = FPRINT | TABLEPASS
\ No newline at end of file
diff --git a/code/modules/clothing/under/jobs/civilian.dm b/code/modules/clothing/under/jobs/civilian.dm
index 79c7272f2c1..7a8d714d4f6 100644
--- a/code/modules/clothing/under/jobs/civilian.dm
+++ b/code/modules/clothing/under/jobs/civilian.dm
@@ -6,7 +6,7 @@
 	icon_state = "ba_suit"
 	item_state = "ba_suit"
 	item_color = "ba_suit"
-	flags = FPRINT | TABLEPASS | ONESIZEFITSALL
+	flags = FPRINT | TABLEPASS
 
 
 /obj/item/clothing/under/rank/captain //Alright, technically not a 'civilian' but its better then giving a .dm file for a single define.
@@ -15,7 +15,7 @@
 	icon_state = "captain"
 	item_state = "caparmor"
 	item_color = "captain"
-	flags = FPRINT | TABLEPASS | ONESIZEFITSALL
+	flags = FPRINT | TABLEPASS
 
 
 /obj/item/clothing/under/rank/cargo
@@ -32,7 +32,7 @@
 	icon_state = "cargotech"
 	item_state = "lb_suit"
 	item_color = "cargo"
-	flags = FPRINT | TABLEPASS | ONESIZEFITSALL
+	flags = FPRINT | TABLEPASS
 
 
 /obj/item/clothing/under/rank/chaplain
@@ -41,7 +41,7 @@
 	icon_state = "chaplain"
 	item_state = "bl_suit"
 	item_color = "chapblack"
-	flags = FPRINT | TABLEPASS | ONESIZEFITSALL
+	flags = FPRINT | TABLEPASS
 
 
 /obj/item/clothing/under/rank/chef
@@ -49,7 +49,7 @@
 	name = "chef's uniform"
 	icon_state = "chef"
 	item_color = "chef"
-	flags = FPRINT | TABLEPASS | ONESIZEFITSALL
+	flags = FPRINT | TABLEPASS
 
 
 /obj/item/clothing/under/rank/clown
@@ -58,7 +58,7 @@
 	icon_state = "clown"
 	item_state = "clown"
 	item_color = "clown"
-	flags = FPRINT | TABLEPASS | ONESIZEFITSALL
+	flags = FPRINT | TABLEPASS
 	fitted = 0
 
 
@@ -68,7 +68,7 @@
 	icon_state = "hop"
 	item_state = "b_suit"
 	item_color = "hop"
-	flags = FPRINT | TABLEPASS | ONESIZEFITSALL
+	flags = FPRINT | TABLEPASS
 
 
 /obj/item/clothing/under/rank/hydroponics
@@ -78,7 +78,7 @@
 	item_state = "g_suit"
 	item_color = "hydroponics"
 	permeability_coefficient = 0.50
-	flags = FPRINT | TABLEPASS | ONESIZEFITSALL
+	flags = FPRINT | TABLEPASS
 
 
 /obj/item/clothing/under/rank/janitor
@@ -87,7 +87,7 @@
 	icon_state = "janitor"
 	item_color = "janitor"
 	armor = list(melee = 0, bullet = 0, laser = 0,energy = 0, bomb = 0, bio = 10, rad = 0)
-	flags = FPRINT | TABLEPASS | ONESIZEFITSALL
+	flags = FPRINT | TABLEPASS
 
 
 /obj/item/clothing/under/lawyer
@@ -148,7 +148,7 @@
 	icon_state = "mime"
 	item_state = "mime"
 	item_color = "mime"
-	flags = FPRINT | TABLEPASS | ONESIZEFITSALL
+	flags = FPRINT | TABLEPASS
 
 /obj/item/clothing/under/rank/miner
 	desc = "It's a snappy jumpsuit with a sturdy set of overalls. It is very dirty."
diff --git a/code/modules/clothing/under/jobs/engineering.dm b/code/modules/clothing/under/jobs/engineering.dm
index a13c3267c42..f348b801a53 100644
--- a/code/modules/clothing/under/jobs/engineering.dm
+++ b/code/modules/clothing/under/jobs/engineering.dm
@@ -6,7 +6,7 @@
 	item_state = "g_suit"
 	item_color = "chief"
 	armor = list(melee = 0, bullet = 0, laser = 0,energy = 0, bomb = 0, bio = 0, rad = 10)
-	flags = FPRINT | TABLEPASS | ONESIZEFITSALL
+	flags = FPRINT | TABLEPASS
 
 /obj/item/clothing/under/rank/atmospheric_technician
 	desc = "It's a jumpsuit worn by atmospheric technicians."
@@ -14,7 +14,7 @@
 	icon_state = "atmos"
 	item_state = "atmos_suit"
 	item_color = "atmos"
-	flags = FPRINT | TABLEPASS | ONESIZEFITSALL
+	flags = FPRINT | TABLEPASS
 
 /obj/item/clothing/under/rank/engineer
 	desc = "It's an orange high visibility jumpsuit worn by engineers. It has minor radiation shielding."
@@ -23,7 +23,7 @@
 	item_state = "engi_suit"
 	item_color = "engine"
 	armor = list(melee = 0, bullet = 0, laser = 0,energy = 0, bomb = 0, bio = 0, rad = 10)
-	flags = FPRINT | TABLEPASS | ONESIZEFITSALL
+	flags = FPRINT | TABLEPASS
 
 /obj/item/clothing/under/rank/roboticist
 	desc = "It's a slimming black with reinforced seams; great for industrial work."
diff --git a/code/modules/clothing/under/jobs/medsci.dm b/code/modules/clothing/under/jobs/medsci.dm
index 687063f2ee1..6691f62619a 100644
--- a/code/modules/clothing/under/jobs/medsci.dm
+++ b/code/modules/clothing/under/jobs/medsci.dm
@@ -8,7 +8,7 @@
 	item_state = "g_suit"
 	item_color = "director"
 	armor = list(melee = 0, bullet = 0, laser = 0,energy = 0, bomb = 0, bio = 10, rad = 0)
-	flags = FPRINT | TABLEPASS | ONESIZEFITSALL
+	flags = FPRINT | TABLEPASS
 
 /obj/item/clothing/under/rank/scientist
 	desc = "It's made of a special fiber that provides minor protection against biohazards. It has markings that denote the wearer as a scientist."
@@ -18,7 +18,7 @@
 	item_color = "toxinswhite"
 	permeability_coefficient = 0.50
 	armor = list(melee = 0, bullet = 0, laser = 0,energy = 0, bomb = 10, bio = 0, rad = 0)
-	flags = FPRINT | TABLEPASS | ONESIZEFITSALL
+	flags = FPRINT | TABLEPASS
 
 
 /obj/item/clothing/under/rank/chemist
@@ -50,7 +50,7 @@
 	item_color = "geneticswhite"
 	permeability_coefficient = 0.50
 	armor = list(melee = 0, bullet = 0, laser = 0,energy = 0, bomb = 0, bio = 10, rad = 0)
-	flags = FPRINT | TABLEPASS | ONESIZEFITSALL
+	flags = FPRINT | TABLEPASS
 
 /obj/item/clothing/under/rank/virologist
 	desc = "It's made of a special fiber that gives special protection against biohazards. It has a virologist rank stripe on it."
@@ -78,7 +78,7 @@
 	item_color = "medical"
 	permeability_coefficient = 0.50
 	armor = list(melee = 0, bullet = 0, laser = 0,energy = 0, bomb = 0, bio = 10, rad = 0)
-	flags = FPRINT | TABLEPASS | ONESIZEFITSALL
+	flags = FPRINT | TABLEPASS
 
 /obj/item/clothing/under/rank/medical/blue
 	name = "medical scrubs"
diff --git a/code/modules/clothing/under/jobs/security.dm b/code/modules/clothing/under/jobs/security.dm
index a8fe7017964..dc444ea6224 100644
--- a/code/modules/clothing/under/jobs/security.dm
+++ b/code/modules/clothing/under/jobs/security.dm
@@ -16,7 +16,7 @@
 	item_state = "r_suit"
 	item_color = "warden"
 	armor = list(melee = 10, bullet = 0, laser = 0,energy = 0, bomb = 0, bio = 0, rad = 0)
-	flags = FPRINT | TABLEPASS | ONESIZEFITSALL
+	flags = FPRINT | TABLEPASS
 
 /obj/item/clothing/under/rank/security
 	name = "security officer's jumpsuit"
@@ -25,7 +25,7 @@
 	item_state = "r_suit"
 	item_color = "secred"
 	armor = list(melee = 10, bullet = 0, laser = 0,energy = 0, bomb = 0, bio = 0, rad = 0)
-	flags = FPRINT | TABLEPASS | ONESIZEFITSALL
+	flags = FPRINT | TABLEPASS
 
 /*
  * Detective
@@ -37,7 +37,7 @@
 	item_state = "det"
 	item_color = "detective"
 	armor = list(melee = 10, bullet = 0, laser = 0,energy = 0, bomb = 0, bio = 0, rad = 0)
-	flags = FPRINT | TABLEPASS | ONESIZEFITSALL
+	flags = FPRINT | TABLEPASS
 
 /*
  * Head of Security
@@ -49,7 +49,7 @@
 	item_state = "r_suit"
 	item_color = "hosred"
 	armor = list(melee = 10, bullet = 0, laser = 0,energy = 0, bomb = 0, bio = 0, rad = 0)
-	flags = FPRINT | TABLEPASS | ONESIZEFITSALL
+	flags = FPRINT | TABLEPASS
 
 /*
  * Jensen cosplay gear
diff --git a/code/modules/clothing/under/miscellaneous.dm b/code/modules/clothing/under/miscellaneous.dm
index 032564a1ed3..ddd4470ba7a 100644
--- a/code/modules/clothing/under/miscellaneous.dm
+++ b/code/modules/clothing/under/miscellaneous.dm
@@ -24,7 +24,7 @@
 	name = "amish suit"
 	icon_state = "sl_suit"
 	item_color = "sl_suit"
-	flags = FPRINT | TABLEPASS | ONESIZEFITSALL
+	flags = FPRINT | TABLEPASS
 
 /obj/item/clothing/under/roman
 	name = "roman armor"
@@ -40,7 +40,7 @@
 	icon_state = "waiter"
 	item_state = "waiter"
 	item_color = "waiter"
-	flags = FPRINT | TABLEPASS | ONESIZEFITSALL
+	flags = FPRINT | TABLEPASS
 
 /obj/item/clothing/under/rank/mailman
 	name = "mailman's jumpsuit"
@@ -115,7 +115,7 @@
 	desc = "A jumpsuit with owl wings. Photorealistic owl feathers! Twooooo!"
 	icon_state = "owl"
 	item_color = "owl"
-	flags = FPRINT | TABLEPASS | ONESIZEFITSALL
+	flags = FPRINT | TABLEPASS
 	fitted = 0
 
 /obj/item/clothing/under/johnny
diff --git a/code/modules/mob/living/carbon/metroid/metroid.dm b/code/modules/mob/living/carbon/metroid/metroid.dm
index 62c6efc75df..54870fdfcf2 100644
--- a/code/modules/mob/living/carbon/metroid/metroid.dm
+++ b/code/modules/mob/living/carbon/metroid/metroid.dm
@@ -845,7 +845,7 @@ mob/living/carbon/slime/var/temperature_resistance = T0C+75
 	body_parts_covered = FULL_BODY
 	slowdown = 1.0
 	flags_inv = HIDEGLOVES|HIDESHOES|HIDEJUMPSUIT
-	flags = FPRINT | TABLEPASS | ONESIZEFITSALL | STOPSPRESSUREDMAGE | ABSTRACT
+	flags = FPRINT | TABLEPASS | STOPSPRESSUREDMAGE | ABSTRACT
 	heat_protection = CHEST|GROIN|LEGS|FEET|ARMS|HANDS | HEAD
 	max_heat_protection_temperature = FIRE_SUIT_MAX_TEMP_PROTECT
 	cold_protection = CHEST | GROIN | LEGS | FEET | ARMS | HANDS | HEAD