Hardsuit Helmets can now be used as internals masks. Rejoice, CE mains.

Also reworks internals code a little to be much more friendly. Any head or mask item with the flag should now function as an internals mask if it has the ALLOWSINTERNALS flag.

code/_onclick/hud/screen_objects.dm

@@ -280,7 +280,7 @@
 /obj/screen/internals/Click()
 	if(!iscarbon(usr))
 		return
-	var/mob/living/carbon/C = usr
+	var/mob/living/carbon/human/C = usr
 	if(C.incapacitated())
 		return
 
@@ -290,16 +290,19 @@
 		icon_state = "internal0"
 	else
 		if(!C.getorganslot(ORGAN_SLOT_BREATHING_TUBE))
-			if(!istype(C.wear_mask, /obj/item/clothing/mask))
+			var/obj/item/clothing/check
+			var/internals = FALSE
+
+			for(check in C.get_internal_slots())
+				if(istype(check, /obj/item/clothing/mask))
+					var/obj/item/clothing/mask/M = check
+					if(M.mask_adjusted)
+						M.adjustmask(C)
+				if(CHECK_BITFIELD(check.clothing_flags, ALLOWINTERNALS))
+					internals = TRUE
+			if(!internals)
 				to_chat(C, "<span class='warning'>You are not wearing an internals mask!</span>")
-				return 1
-			else
-				var/obj/item/clothing/mask/M = C.wear_mask
-				if(M.mask_adjusted) // if mask on face but pushed down
-					M.adjustmask(C) // adjust it back
-				if( !(M.clothing_flags & MASKINTERNALS) )
-					to_chat(C, "<span class='warning'>You are not wearing an internals mask!</span>")
-					return
+				return
 
 		var/obj/item/I = C.is_holding_item_of_type(/obj/item/tank)
 		if(I)