diff --git a/code/_onclick/hud/human.dm b/code/_onclick/hud/human.dm
index b372ec6882..5877e49b92 100644
--- a/code/_onclick/hud/human.dm
+++ b/code/_onclick/hud/human.dm
@@ -28,6 +28,7 @@
 		inv_box.icon = ui_style
 		inv_box.color = ui_color
 		inv_box.alpha = ui_alpha
+		inv_box.hud = src
 
 		var/list/slot_data =  hud_data.gear[gear_slot]
 		inv_box.name =        gear_slot
@@ -192,6 +193,7 @@
 		using.screen_loc = ui_swaphand1
 		using.color = ui_color
 		using.alpha = ui_alpha
+		using.hud = src
 		src.adding += using
 
 		using = new /obj/screen/inventory()
@@ -201,6 +203,7 @@
 		using.screen_loc = ui_swaphand2
 		using.color = ui_color
 		using.alpha = ui_alpha
+		using.hud = src
 		src.adding += using
 
 	if(hud_data.has_resist)
diff --git a/code/_onclick/hud/screen_objects.dm b/code/_onclick/hud/screen_objects.dm
index f9e8506108..aede02fc1d 100644
--- a/code/_onclick/hud/screen_objects.dm
+++ b/code/_onclick/hud/screen_objects.dm
@@ -31,7 +31,36 @@
 
 /obj/screen/inventory
 	var/slot_id	//The indentifier for the slot. It has nothing to do with ID cards.
+	var/list/object_overlays = list() // Required for inventory/screen overlays.
 
+/obj/screen/inventory/MouseEntered()
+	..()
+	add_overlays()
+
+/obj/screen/inventory/MouseExited()
+	..()
+	cut_overlay(object_overlays)
+	object_overlays.Cut()
+
+/obj/screen/inventory/proc/add_overlays()
+	var/mob/user = hud.mymob
+
+	if(hud && user && slot_id)
+		var/obj/item/holding = user.get_active_hand()
+
+		if(!holding || user.get_equipped_item(slot_id))
+			return
+
+		var/image/item_overlay = image(holding)
+		item_overlay.alpha = 92
+
+		if(!holding.mob_can_equip(user, slot_id, disable_warning = TRUE))
+			item_overlay.color = "#ff0000"
+		else
+			item_overlay.color = "#00ff00"
+
+		object_overlays += item_overlay
+		add_overlay(object_overlays)
 
 /obj/screen/close
 	name = "close"
@@ -102,78 +131,116 @@
 	icon_state = "zone_sel"
 	screen_loc = ui_zonesel
 	var/selecting = BP_TORSO
+	var/static/list/hover_overlays_cache = list()
+	var/hovering_choice
+	var/mutable_appearance/selecting_appearance
 
 /obj/screen/zone_sel/Click(location, control,params)
+	if(isobserver(usr))
+		return
+
 	var/list/PL = params2list(params)
 	var/icon_x = text2num(PL["icon-x"])
 	var/icon_y = text2num(PL["icon-y"])
-	var/old_selecting = selecting //We're only going to update_icon() if there's been a change
+	var/choice = get_zone_at(icon_x, icon_y)
+	if(!choice)
+		return 1
 
+	return set_selected_zone(choice, usr)
+
+/obj/screen/zone_sel/MouseEntered(location, control, params)
+	MouseMove(location, control, params)
+
+/obj/screen/zone_sel/MouseMove(location, control, params)
+	if(isobserver(usr))
+		return
+
+	var/list/PL = params2list(params)
+	var/icon_x = text2num(PL["icon-x"])
+	var/icon_y = text2num(PL["icon-y"])
+	var/choice = get_zone_at(icon_x, icon_y)
+
+	if(hovering_choice == choice)
+		return
+	vis_contents -= hover_overlays_cache[hovering_choice]
+	hovering_choice = choice
+
+	var/obj/effect/overlay/zone_sel/overlay_object = hover_overlays_cache[choice]
+	if(!overlay_object)
+		overlay_object = new
+		overlay_object.icon_state = "[choice]"
+		hover_overlays_cache[choice] = overlay_object
+	vis_contents += overlay_object
+
+
+/obj/effect/overlay/zone_sel
+	icon = 'icons/mob/zone_sel.dmi'
+	mouse_opacity = MOUSE_OPACITY_TRANSPARENT
+	alpha = 128
+	anchored = TRUE
+	layer = LAYER_HUD_ABOVE
+	plane = PLANE_PLAYER_HUD_ABOVE
+
+/obj/screen/zone_sel/MouseExited(location, control, params)
+	if(!isobserver(usr) && hovering_choice)
+		vis_contents -= hover_overlays_cache[hovering_choice]
+		hovering_choice = null
+
+/obj/screen/zone_sel/proc/get_zone_at(icon_x, icon_y)
 	switch(icon_y)
 		if(1 to 3) //Feet
 			switch(icon_x)
 				if(10 to 15)
-					selecting = BP_R_FOOT
+					return BP_R_FOOT
 				if(17 to 22)
-					selecting = BP_L_FOOT
-				else
-					return 1
+					return BP_L_FOOT
 		if(4 to 9) //Legs
 			switch(icon_x)
 				if(10 to 15)
-					selecting = BP_R_LEG
+					return BP_R_LEG
 				if(17 to 22)
-					selecting = BP_L_LEG
-				else
-					return 1
+					return BP_L_LEG
 		if(10 to 13) //Hands and groin
 			switch(icon_x)
 				if(8 to 11)
-					selecting = BP_R_HAND
+					return BP_R_HAND
 				if(12 to 20)
-					selecting = BP_GROIN
+					return BP_GROIN
 				if(21 to 24)
-					selecting = BP_L_HAND
-				else
-					return 1
+					return BP_L_HAND
 		if(14 to 22) //Chest and arms to shoulders
 			switch(icon_x)
 				if(8 to 11)
-					selecting = BP_R_ARM
+					return BP_R_ARM
 				if(12 to 20)
-					selecting = BP_TORSO
+					return BP_TORSO
 				if(21 to 24)
-					selecting = BP_L_ARM
-				else
-					return 1
+					return BP_L_ARM
 		if(23 to 30) //Head, but we need to check for eye or mouth
 			if(icon_x in 12 to 20)
-				selecting = BP_HEAD
 				switch(icon_y)
 					if(23 to 24)
 						if(icon_x in 15 to 17)
-							selecting = O_MOUTH
+							return O_MOUTH
 					if(26) //Eyeline, eyes are on 15 and 17
 						if(icon_x in 14 to 18)
-							selecting = O_EYES
+							return O_EYES
 					if(25 to 27)
 						if(icon_x in 15 to 17)
-							selecting = O_EYES
+							return O_EYES
+				return BP_HEAD
 
-	if(old_selecting != selecting)
-		update_icon()
-	return 1
-
-/obj/screen/zone_sel/proc/set_selected_zone(bodypart)
-	var/old_selecting = selecting
-	selecting = bodypart
-	if(old_selecting != selecting)
+/obj/screen/zone_sel/proc/set_selected_zone(choice, mob/user)
+	if(isobserver(user))
+		return
+	if(choice != selecting)
+		selecting = choice
 		update_icon()
 
 /obj/screen/zone_sel/update_icon()
-	overlays.Cut()
-	overlays += image('icons/mob/zone_sel.dmi', "[selecting]")
-
+	cut_overlay(selecting_appearance)
+	selecting_appearance = mutable_appearance('icons/mob/zone_sel.dmi', "[selecting]")
+	add_overlay(selecting_appearance)
 
 /obj/screen/Click(location, control, params)
 	if(!usr)	return 1
diff --git a/code/game/objects/items/weapons/storage/internal.dm b/code/game/objects/items/weapons/storage/internal.dm
index 6fbbedf069..ddb7e873e6 100644
--- a/code/game/objects/items/weapons/storage/internal.dm
+++ b/code/game/objects/items/weapons/storage/internal.dm
@@ -18,7 +18,7 @@
 /obj/item/weapon/storage/internal/attack_hand()
 	return		//make sure this is never picked up
 
-/obj/item/weapon/storage/internal/mob_can_equip()
+/obj/item/weapon/storage/internal/mob_can_equip(M as mob, slot, disable_warning = 0)
 	return 0	//make sure this is never picked up
 
 //Helper procs to cleanly implement internal storages - storage items that provide inventory slots for other items.
diff --git a/code/modules/clothing/clothing.dm b/code/modules/clothing/clothing.dm
index 628547ab45..2bb6022180 100644
--- a/code/modules/clothing/clothing.dm
+++ b/code/modules/clothing/clothing.dm
@@ -59,7 +59,7 @@
 		user.recalculate_vis()
 
 //BS12: Species-restricted clothing check.
-/obj/item/clothing/mob_can_equip(M as mob, slot)
+/obj/item/clothing/mob_can_equip(M as mob, slot, disable_warning = 0)
 
 	//if we can't equip the item anyway, don't bother with species_restricted (cuts down on spam)
 	if (!..())
diff --git a/code/modules/clothing/gloves/arm_guards.dm b/code/modules/clothing/gloves/arm_guards.dm
index 558f855545..791bb0a10b 100644
--- a/code/modules/clothing/gloves/arm_guards.dm
+++ b/code/modules/clothing/gloves/arm_guards.dm
@@ -7,7 +7,7 @@
 	w_class = ITEMSIZE_NORMAL
 	drop_sound = 'sound/items/drop/metalshield.ogg'
 
-/obj/item/clothing/gloves/arm_guard/mob_can_equip(var/mob/living/carbon/human/H, slot)
+/obj/item/clothing/gloves/arm_guard/mob_can_equip(var/mob/living/carbon/human/H, slot, disable_warning = 0)
 	if(..()) //This will only run if no other problems occured when equiping.
 		if(H.wear_suit)
 			if(H.wear_suit.body_parts_covered & ARMS)
diff --git a/code/modules/clothing/gloves/gauntlets.dm b/code/modules/clothing/gloves/gauntlets.dm
index 8807fb93ad..eb5d05c909 100644
--- a/code/modules/clothing/gloves/gauntlets.dm
+++ b/code/modules/clothing/gloves/gauntlets.dm
@@ -14,7 +14,7 @@
 	punch_force = 5
 	var/obj/item/clothing/gloves/gloves = null	//Undergloves
 
-/obj/item/clothing/gloves/gauntlets/mob_can_equip(mob/user)
+/obj/item/clothing/gloves/gauntlets/mob_can_equip(mob/user, slot, disable_warning = 0)
 	var/mob/living/carbon/human/H = user
 	if(H.gloves)
 		gloves = H.gloves
diff --git a/code/modules/clothing/masks/monitor.dm b/code/modules/clothing/masks/monitor.dm
index 230f224d09..be337c9067 100644
--- a/code/modules/clothing/masks/monitor.dm
+++ b/code/modules/clothing/masks/monitor.dm
@@ -33,7 +33,7 @@
 	canremove = 1
 	return ..()
 
-/obj/item/clothing/mask/monitor/mob_can_equip(var/mob/living/carbon/human/user, var/slot)
+/obj/item/clothing/mask/monitor/mob_can_equip(var/mob/living/carbon/human/user, var/slot, disable_warning = FALSE)
 	if (!..())
 		return 0
 	if(istype(user))
diff --git a/code/modules/clothing/shoes/magboots.dm b/code/modules/clothing/shoes/magboots.dm
index 57b8a0911a..816c5052fc 100644
--- a/code/modules/clothing/shoes/magboots.dm
+++ b/code/modules/clothing/shoes/magboots.dm
@@ -42,7 +42,7 @@
 	user.update_inv_shoes()	//so our mob-overlays update
 	user.update_action_buttons()
 
-/obj/item/clothing/shoes/magboots/mob_can_equip(mob/user, slot)
+/obj/item/clothing/shoes/magboots/mob_can_equip(mob/user, slot, disable_warning = FALSE)
 	var/mob/living/carbon/human/H = user
 
 	if(H.shoes)
diff --git a/code/modules/clothing/suits/armor.dm b/code/modules/clothing/suits/armor.dm
index 691f53de5a..3920ddd636 100644
--- a/code/modules/clothing/suits/armor.dm
+++ b/code/modules/clothing/suits/armor.dm
@@ -520,7 +520,7 @@
 		|ACCESSORY_SLOT_ARMOR_M)
 	blood_overlay_type = "armor"
 
-/obj/item/clothing/suit/armor/pcarrier/mob_can_equip(var/mob/living/carbon/human/H, slot)
+/obj/item/clothing/suit/armor/pcarrier/mob_can_equip(var/mob/living/carbon/human/H, slot, disable_warning = FALSE)
 	if(..()) //This will only run if no other problems occured when equiping.
 		if(H.gloves)
 			if(H.gloves.body_parts_covered & ARMS)