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/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)