Enables the combo blend mode for most colorable loadout gear.

-The most meaning the colorable uniforms, suits, gloves, shoes, headgear, earwear, and accessories.
-Only affects mob icons for now, the inventory/floor icons still in old blend.
-Sort of a framework for possible additional options to come.
-Also messed around with some other stuff such as adding on-ear icons to the rest of the flower pins and bows, and made the base icons for the beanies lighter than the middle gray they were.

code/game/objects/items.dm

@@ -80,6 +80,7 @@
 	var/list/sprite_sheets_obj = list()
 
 	var/toolspeed = 1.0 // This is a multipler on how 'fast' a tool works.  e.g. setting this to 0.5 will make the tool work twice as fast.
+	var/addblends // Icon overlay for ADD highlights when applicable.
 
 /obj/item/New()
 	..()

code/modules/clothing/gloves/color.dm

@@ -77,6 +77,7 @@
 	desc = "A pair of gloves that reach past the elbow.  Fancy!"
 	name = "evening gloves"
 	icon_state = "evening_gloves"
+	addblends = "evening_gloves_a"
 
 	cold_protection = HANDS
 	min_cold_protection_temperature = GLOVES_MIN_COLD_PROTECTION_TEMPERATURE

code/modules/clothing/head/misc.dm

@@ -34,9 +34,11 @@
 
 /obj/item/clothing/head/hairflower/white
 	icon_state = "hairflower_white"
+	addblends = "hairflower_white_a"
 
 /obj/item/clothing/head/hairflower/bow
 	icon_state = "bow"
+	addblends = "bow_a"
 	name = "hair bow"
 	desc = "A ribbon tied into a bow with a clip on the back to attach to hair."
 	item_state_slots = list(slot_r_hand_str = "pill", slot_l_hand_str = "pill")
@@ -155,6 +157,7 @@
 
 /obj/item/clothing/head/flatcap/grey
 	icon_state = "flat_capw"
+	addblends = "flat_capw_a"
 	item_state_slots = list(slot_r_hand_str = "greysoft", slot_l_hand_str = "greysoft")
 
 /obj/item/clothing/head/pirate
@@ -300,6 +303,7 @@
 	name = "hijab"
 	desc = "A veil that is wrapped to cover the head and chest"
 	icon_state = "hijab"
+	addblends = "hijab_a"
 	item_state_slots = list(slot_r_hand_str = "beret_white", slot_l_hand_str = "beret_white")
 	body_parts_covered = 0
 	flags_inv = BLOCKHAIR
@@ -308,12 +312,14 @@
 	name = "kippa"
 	desc = "A small, brimless cap."
 	icon_state = "kippa"
+	addblends = "kippa_a"
 	body_parts_covered = 0
 
 /obj/item/clothing/head/turban
 	name = "turban"
 	desc = "A cloth used to wind around the head"
 	icon_state = "turban"
+	addblends = "turban_a"
 	item_state_slots = list(slot_r_hand_str = "beret_white", slot_l_hand_str = "beret_white")
 	body_parts_covered = 0
 	flags_inv = BLOCKHEADHAIR
@@ -322,24 +328,28 @@
 	name = "taqiyah"
 	desc = "A short, rounded skullcap usually worn for religious purposes."
 	icon_state = "taqiyah"
+	addblends = "taqiyah_a"
 	item_state_slots = list(slot_r_hand_str = "taq", slot_l_hand_str = "taq")
 
 /obj/item/clothing/head/beanie
 	name = "beanie"
 	desc = "A head-hugging brimless winter cap. This one is tight."
 	icon_state = "beanie"
+	addblends = "beanie_a"
 	body_parts_covered = 0
 
 /obj/item/clothing/head/beanie_loose
 	name = "loose beanie"
 	desc = "A head-hugging brimless winter cap. This one is loose."
 	icon_state = "beanie_hang"
+	addblends = "beanie_hang_a"
 	body_parts_covered = 0
 
 /obj/item/clothing/head/beretg
 	name = "beret"
 	desc = "A beret, an artists favorite headwear."
 	icon_state = "beret_g"
+	addblends = "beret_g_a"
 	body_parts_covered = 0
 
 /obj/item/clothing/head/sombrero

code/modules/clothing/shoes/colour.dm

@@ -54,6 +54,7 @@
 	name = "white flats"
 	desc = "Shiny white flats."
 	icon_state = "flatswhite"
+	addblends = "flatswhite_a"
 	item_state_slots = list(slot_r_hand_str = "white", slot_l_hand_str = "white")
 
 /obj/item/clothing/shoes/flats/white/color

code/modules/clothing/shoes/miscellaneous.dm

@@ -124,23 +124,27 @@
 	name = "flip flops"
 	desc = "A pair of foam flip flops. For those not afraid to show a little ankle."
 	icon_state = "thongsandal"
+	addblends = "thongsandal_a"
 
 /obj/item/clothing/shoes/athletic
 	name = "athletic shoes"
 	desc = "A pair of sleek atheletic shoes. Made by and for the sporty types."
 	icon_state = "sportshoe"
+	addblends = "sportshoe_a"
 	item_state_slots = list(slot_r_hand_str = "sportheld", slot_l_hand_str = "sportheld")
 
 /obj/item/clothing/shoes/skater
 	name = "skater shoes"
 	desc = "A pair of wide shoes with thick soles.  Designed for skating."
 	icon_state = "skatershoe"
+	addblends = "skatershoe_a"
 	item_state_slots = list(slot_r_hand_str = "skaterheld", slot_l_hand_str = "skaterheld")
 
 /obj/item/clothing/shoes/heels
 	name = "high heels"
 	desc = "A pair of high-heeled shoes. Fancy!"
 	icon_state = "heels"
+	addblends = "heels_a"
 
 /obj/item/clothing/shoes/footwraps
 	name = "cloth footwraps"

code/modules/clothing/suits/miscellaneous.dm

@@ -277,6 +277,7 @@ obj/item/clothing/suit/kimono
 	name = "kimono"
 	desc = "A traditional Japanese kimono."
 	icon_state = "kimono"
+	addblends = "kimono_a"
 
 /*
  * coats
@@ -344,6 +345,7 @@ obj/item/clothing/suit/storage/toggle/peacoat
 	name = "peacoat"
 	desc = "A well-tailored, stylish peacoat."
 	icon_state = "peacoat"
+	addblends = "peacoat_a"
 	item_state_slots = list(slot_r_hand_str = "peacoat", slot_l_hand_str = "peacoat")
 	flags_inv = HIDEHOLSTER
 /*

code/modules/clothing/under/accessories/accessory.dm

@@ -45,6 +45,16 @@
 			mob_overlay = image("icon" = sprite_sheets[wearer.species.get_bodytype(wearer)], "icon_state" = "[tmp_icon_state]")
 		else
 			mob_overlay = image("icon" = INV_ACCESSORIES_DEF_ICON, "icon_state" = "[tmp_icon_state]")
+		if(addblends)
+			var/icon/base = new/icon("icon" = mob_overlay.icon, "icon_state" = mob_overlay.icon_state)
+			var/addblend_icon = new/icon("icon" = mob_overlay.icon, "icon_state" = src.addblends)
+			if(color)
+				base.Blend(src.color, ICON_MULTIPLY)
+			base.Blend(addblend_icon, ICON_ADD)
+			mob_overlay = image(base)
+		else
+			mob_overlay.color = src.color
+
 	return mob_overlay
 
 //when user attached an accessory to S

code/modules/clothing/under/accessories/armband.dm

@@ -37,6 +37,7 @@
 /obj/item/clothing/accessory/armband/med/color
 	name = "armband"
 	desc = "A fancy armband."
+	addblends = "med_a"
 
 /obj/item/clothing/accessory/armband/medblue
 	name = "EMT armband"

code/modules/clothing/under/miscellaneous.dm

@@ -627,17 +627,20 @@
 	name = "long dress"
 	desc = "A long dress."
 	icon_state = "whitedress2"
+	addblends = "whitedress2_a"
 	flags_inv = HIDESHOES
 
 /obj/item/clothing/under/dress/white3
 	name = "short dress"
 	desc = "A short, plain dress."
 	icon_state = "whitedress3"
+	addblends = "whitedress3_a"
 
 /obj/item/clothing/under/dress/white4
 	name = "long flared dress"
 	desc = "A long white dress that flares out at the bottom."
 	icon_state = "whitedress4"
+	addblends = "whitedress4_a"
 	flags_inv = HIDESHOES
 
 /obj/item/clothing/under/dress/darkred

code/modules/clothing/under/pants.dm

@@ -121,6 +121,7 @@
 	name = "yoga pants"
 	desc = "A pair of tight-fitting yoga pants for those lazy days."
 	icon_state = "yogapants"
+	addblends = "yogapants_a"
 
 /*
  * Baggy Pants

code/modules/mob/living/carbon/human/update_icons.dm

@@ -505,7 +505,16 @@ var/global/list/damage_icon_parts = list()
 
 		//need to append _s to the icon state for legacy compatibility
 		var/image/standing = image(icon = under_icon, icon_state = "[under_state]_s")
-		standing.color = w_uniform.color
+
+		if(w_uniform.addblends)
+			var/icon/base = new/icon("icon" = standing.icon, "icon_state" = standing.icon_state)
+			var/addblend_icon = new/icon("icon" = standing.icon, "icon_state" = w_uniform.addblends)
+			if(w_uniform.color)
+				base.Blend(w_uniform.color, ICON_MULTIPLY)
+			base.Blend(addblend_icon, ICON_ADD)
+			standing = image(base)
+		else
+			standing.color = w_uniform.color
 
 		//apply blood overlay
 		if(w_uniform.blood_DNA)
@@ -569,7 +578,15 @@ var/global/list/damage_icon_parts = list()
 			bloodsies.color = gloves.blood_color
 			standing.overlays	+= bloodsies
 		gloves.screen_loc = ui_gloves
-		standing.color = gloves.color
+		if(gloves.addblends)
+			var/icon/base = new/icon("icon" = standing.icon, "icon_state" = standing.icon_state)
+			var/addblend_icon = new/icon("icon" = standing.icon, "icon_state" = gloves.addblends)
+			if(gloves.color)
+				base.Blend(gloves.color, ICON_MULTIPLY)
+			base.Blend(addblend_icon, ICON_ADD)
+			standing = image(base)
+		else
+			standing.color = gloves.color
 		overlays_standing[GLOVES_LAYER]	= standing
 	else
 		if(blood_DNA)
@@ -590,7 +607,15 @@ var/global/list/damage_icon_parts = list()
 			standing = image("icon" = glasses.sprite_sheets[species.get_bodytype(src)], "icon_state" = "[glasses.icon_state]")
 		else
 			standing = image("icon" = 'icons/mob/eyes.dmi', "icon_state" = "[glasses.icon_state]")
-		standing.color = glasses.color
+		if(glasses.addblends)
+			var/icon/base = new/icon("icon" = standing.icon, "icon_state" = standing.icon_state)
+			var/addblend_icon = new/icon("icon" = standing.icon, "icon_state" = glasses.addblends)
+			if(glasses.color)
+				base.Blend(glasses.color, ICON_MULTIPLY)
+			base.Blend(addblend_icon, ICON_ADD)
+			standing = image(base)
+		else
+			standing.color = glasses.color
 		overlays_standing[GLASSES_LAYER] = standing
 
 	else
@@ -618,7 +643,15 @@ var/global/list/damage_icon_parts = list()
 				standing = image("icon" = l_ear.sprite_sheets[species.get_bodytype(src)], "icon_state" = "[t_type]")
 			else
 				standing = image("icon" = 'icons/mob/ears.dmi', "icon_state" = "[t_type]")
-			standing.color = l_ear.color
+			if(l_ear.addblends)
+				var/icon/base = new/icon("icon" = standing.icon, "icon_state" = standing.icon_state)
+				var/addblend_icon = new/icon("icon" = standing.icon, "icon_state" = l_ear.addblends)
+				if(l_ear.color)
+					base.Blend(l_ear.color, ICON_MULTIPLY)
+				base.Blend(addblend_icon, ICON_ADD)
+				standing = image(base)
+			else
+				standing.color = l_ear.color
 			both.overlays += standing
 
 		if(r_ear)
@@ -632,7 +665,15 @@ var/global/list/damage_icon_parts = list()
 				standing = image("icon" = r_ear.sprite_sheets[species.get_bodytype(src)], "icon_state" = "[t_type]")
 			else
 				standing = image("icon" = 'icons/mob/ears.dmi', "icon_state" = "[t_type]")
-			standing.color = r_ear.color
+			if(r_ear.addblends)
+				var/icon/base = new/icon("icon" = standing.icon, "icon_state" = standing.icon_state)
+				var/addblend_icon = new/icon("icon" = standing.icon, "icon_state" = r_ear.addblends)
+				if(r_ear.color)
+					base.Blend(r_ear.color, ICON_MULTIPLY)
+				base.Blend(addblend_icon, ICON_ADD)
+				standing = image(base)
+			else
+				standing.color = r_ear.color
 			both.overlays += standing
 
 		overlays_standing[EARS_LAYER] = both
@@ -666,8 +707,18 @@ var/global/list/damage_icon_parts = list()
 			var/image/bloodsies = image("icon" = species.get_blood_mask(src), "icon_state" = "shoeblood")
 			bloodsies.color = shoes.blood_color
 			standing.overlays += bloodsies
-		standing.color = shoes.color
+
+		if(shoes.addblends)
+			var/icon/base = new/icon("icon" = standing.icon, "icon_state" = standing.icon_state)
+			var/addblend_icon = new/icon("icon" = standing.icon, "icon_state" = shoes.addblends)
+			if(shoes.color)
+				base.Blend(shoes.color, ICON_MULTIPLY)
+			base.Blend(addblend_icon, ICON_ADD)
+			standing = image(base)
+		else
+			standing.color = shoes.color
 		overlays_standing[shoe_layer] = standing
+
 	else
 		if(feet_blood_DNA)
 			var/image/bloodsies = image("icon" = species.get_blood_mask(src), "icon_state" = "shoeblood")
@@ -733,7 +784,15 @@ var/global/list/damage_icon_parts = list()
 			if(hat.on && light_overlay_cache[cache_key])
 				standing.overlays |= light_overlay_cache[cache_key]
 
-		standing.color = head.color
+		if(head.addblends)
+			var/icon/base = new/icon("icon" = standing.icon, "icon_state" = standing.icon_state)
+			var/addblend_icon = new/icon("icon" = standing.icon, "icon_state" = head.addblends)
+			if(head.color)
+				base.Blend(head.color, ICON_MULTIPLY)
+			base.Blend(addblend_icon, ICON_ADD)
+			standing = image(base)
+		else
+			standing.color = head.color
 		overlays_standing[HEAD_LAYER] = standing
 
 	else
@@ -768,7 +827,15 @@ var/global/list/damage_icon_parts = list()
 					if(!i_state) i_state = i.icon_state
 					standing.overlays	+= image("icon" = 'icons/mob/belt.dmi', "icon_state" = "[i_state]")
 
-		standing.color = belt.color
+		if(belt.addblends)
+			var/icon/base = new/icon("icon" = standing.icon, "icon_state" = standing.icon_state)
+			var/addblend_icon = new/icon("icon" = standing.icon, "icon_state" = belt.addblends)
+			if(belt.color)
+				base.Blend(belt.color, ICON_MULTIPLY)
+			base.Blend(addblend_icon, ICON_ADD)
+			standing = image(base)
+		else
+			standing.color = belt.color
 
 		overlays_standing[belt_layer] = standing
 	else
@@ -793,7 +860,16 @@ var/global/list/damage_icon_parts = list()
 			t_icon = wear_suit.item_icons[slot_wear_suit_str]
 
 		standing = image("icon" = t_icon, "icon_state" = "[wear_suit.icon_state]")
-		standing.color = wear_suit.color
+
+		if(wear_suit.addblends)
+			var/icon/base = new/icon("icon" = standing.icon, "icon_state" = standing.icon_state)
+			var/addblend_icon = new/icon("icon" = standing.icon, "icon_state" = wear_suit.addblends)
+			if(wear_suit.color)
+				base.Blend(wear_suit.color, ICON_MULTIPLY)
+			base.Blend(addblend_icon, ICON_ADD)
+			standing = image(base)
+		else
+			standing.color = wear_suit.color
 
 		if( istype(wear_suit, /obj/item/clothing/suit/straight_jacket) )
 			drop_from_inventory(handcuffed)
@@ -843,7 +919,15 @@ var/global/list/damage_icon_parts = list()
 			standing = image("icon" = wear_mask.sprite_sheets[species.get_bodytype(src)], "icon_state" = "[wear_mask.icon_state]")
 		else
 			standing = image("icon" = 'icons/mob/mask.dmi', "icon_state" = "[wear_mask.icon_state]")
-		standing.color = wear_mask.color
+		if(wear_mask.addblends)
+			var/icon/base = new/icon("icon" = standing.icon, "icon_state" = standing.icon_state)
+			var/addblend_icon = new/icon("icon" = standing.icon, "icon_state" = wear_mask.addblends)
+			if(wear_mask.color)
+				base.Blend(wear_mask.color, ICON_MULTIPLY)
+			base.Blend(addblend_icon, ICON_ADD)
+			standing = image(base)
+		else
+			standing.color = wear_mask.color
 
 		if( !istype(wear_mask, /obj/item/clothing/mask/smokable/cigarette) && wear_mask.blood_DNA )
 			var/image/bloodsies = image("icon" = species.get_blood_mask(src), "icon_state" = "maskblood")
@@ -885,7 +969,15 @@ var/global/list/damage_icon_parts = list()
 
 		//apply color
 		var/image/standing = image(icon = overlay_icon, icon_state = overlay_state)
-		standing.color = back.color
+		if(back.addblends)
+			var/icon/base = new/icon("icon" = standing.icon, "icon_state" = standing.icon_state)
+			var/addblend_icon = new/icon("icon" = standing.icon, "icon_state" = back.addblends)
+			if(back.color)
+				base.Blend(back.color, ICON_MULTIPLY)
+			base.Blend(addblend_icon, ICON_ADD)
+			standing = image(base)
+		else
+			standing.color = back.color
 
 		//create the image
 		overlays_standing[BACK_LAYER] = standing