Welding goggles render over bandanas (#22414)

Port of a 'fix' I made on baystation some time back.

Before:
<img width="81" height="89" alt="dreamseeker_JD60oIjWBj"
src="https://github.com/user-attachments/assets/bab4fc4a-96ea-4719-b318-e9ebb0f99dda"
/>

After:
<img width="89" height="88" alt="dreamseeker_FwOnslm1q7"
src="https://github.com/user-attachments/assets/e6d4da4b-2269-4cc5-9cf7-ac4c73bfc993"
/>

code/__DEFINES/icon_layering.dm

@@ -31,19 +31,20 @@
 #define BACK_LAYER            	30
 #define HAIR_LAYER            	31
 #define HAIR_LAYER_EMISSIVE     32
-#define GLASSES_LAYER_ALT     	33
-#define L_EAR_LAYER             34
-#define R_EAR_LAYER           	35
-#define FACEMASK_LAYER        	36
-#define HEAD_LAYER            	37
-#define L_EAR_LAYER_ALT		  	38
-#define R_EAR_LAYER_ALT       	39
-#define GLASSES_LAYER_OVER    	40
-#define COLLAR_LAYER          	41
-#define ABOVE_SUIT_LAYER_WR    	42
-#define HANDCUFF_LAYER        	43
-#define LEGCUFF_LAYER         	44
-#define L_HAND_LAYER          	45
-#define R_HAND_LAYER          	46
-#define FIRE_LAYER_UPPER      	47
-#define TOTAL_LAYERS          	47
+#define L_EAR_LAYER             33
+#define R_EAR_LAYER           	34
+#define HEAD_LAYER_ALT          35
+#define GLASSES_LAYER_ALT     	36
+#define FACEMASK_LAYER        	37
+#define HEAD_LAYER            	38
+#define L_EAR_LAYER_ALT		  	39
+#define R_EAR_LAYER_ALT       	40
+#define GLASSES_LAYER_OVER    	41
+#define COLLAR_LAYER          	42
+#define ABOVE_SUIT_LAYER_WR    	43
+#define HANDCUFF_LAYER        	44
+#define LEGCUFF_LAYER         	45
+#define L_HAND_LAYER          	46
+#define R_HAND_LAYER          	47
+#define FIRE_LAYER_UPPER      	48
+#define TOTAL_LAYERS          	48

code/modules/clothing/clothing.dm

@@ -613,6 +613,8 @@
 	var/light_applied
 	var/on = FALSE
 	var/protects_against_weather = FALSE
+	/// Boolean. If set, uses `HEAD_LAYER_ALT` for mob sprite layering.
+	var/use_alt_layer = FALSE
 
 /obj/item/clothing/head/Initialize(mapload, material_key)
 	. = ..()

code/modules/clothing/head/bandanas.dm

@@ -7,6 +7,7 @@
 	flags_inv = 0
 	body_parts_covered = 0
 	contained_sprite = TRUE
+	use_alt_layer = TRUE
 
 /obj/item/clothing/head/bandana/colorable
 	icon_state = "bandana_colorable"

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

@@ -910,6 +910,7 @@ There are several things that need to be remembered:
 		return
 
 	overlays_raw[HEAD_LAYER] = null
+	overlays_raw[HEAD_LAYER_ALT] = null
 	if(head)
 		var/mob_icon = INV_HEAD_DEF_ICON
 		var/mob_state = head.icon_state
@@ -933,7 +934,12 @@ There are several things that need to be remembered:
 		else
 			mob_icon = INV_HEAD_DEF_ICON
 
-		overlays_raw[HEAD_LAYER] = head.get_mob_overlay(src, mob_icon, mob_state, slot_head_str)
+		var/overlay_layer = HEAD_LAYER
+		if (istype(head, /obj/item/clothing/head))
+			var/obj/item/clothing/head/clothing = head
+			if (clothing.use_alt_layer)
+				overlay_layer = HEAD_LAYER_ALT
+		overlays_raw[overlay_layer] = head.get_mob_overlay(src, mob_icon, mob_state, slot_head_str)
 
 	if (recurse)
 		update_hair(FALSE)

html/changelogs/sierrakomodo-goggles-bandana.yml

@@ -0,0 +1,58 @@
+################################
+# Example Changelog File
+#
+# Note: This file, and files beginning with ".", and files that don't end in ".yml" will not be read. If you change this file, you will look really dumb.
+#
+# Your changelog will be merged with a master changelog. (New stuff added only, and only on the date entry for the day it was merged.)
+# When it is, any changes listed below will disappear.
+#
+# Valid Prefixes:
+#   bugfix
+#     - (fixes bugs)
+#   wip
+#     - (work in progress)
+#   qol
+#     - (quality of life)
+#   soundadd
+#     - (adds a sound)
+#   sounddel
+#     - (removes a sound)
+#   rscadd
+#     - (adds a feature)
+#   rscdel
+#     - (removes a feature)
+#   imageadd
+#     - (adds an image or sprite)
+#   imagedel
+#     - (removes an image or sprite)
+#   spellcheck
+#     - (fixes spelling or grammar)
+#   experiment
+#     - (experimental change)
+#   balance
+#     - (balance changes)
+#   code_imp
+#     - (misc internal code change)
+#   refactor
+#     - (refactors code)
+#   config
+#     - (makes a change to the config files)
+#   admin
+#     - (makes changes to administrator tools)
+#   server
+#     - (miscellaneous changes to server)
+#################################
+
+# Your name.
+author: SierraKomodo
+
+# Optional: Remove this file after generating master changelog.  Useful for PR changelogs that won't get used again.
+delete-after: True
+
+# Any changes you've made.  See valid prefix list above.
+# INDENT WITH TWO SPACES.  NOT TABS.  SPACES.
+# SCREW THIS UP AND IT WON'T WORK.
+# Also, this gets changed to [] after reading.  Just remove the brackets when you add new shit.
+# Please surround your changes in  double quotes ("). It works without them, but if you use certain characters it screws up compiling. The quotes will not show up in the changelog.
+changes:
+  - rscadd: "Welding goggles now render on top of bandanas when flipped up."