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/modules/mob/living/carbon/alien/special/facehugger.dm

@@ -15,7 +15,7 @@
 	icon_state = "facehugger"
 	item_state = "facehugger"
 	w_class = WEIGHT_CLASS_TINY //note: can be picked up by aliens unlike most other items of w_class below 4
-	clothing_flags = MASKINTERNALS
+	clothing_flags = ALLOWINTERNALS
 	throw_range = 5
 	tint = 3
 	flags_cover = MASKCOVERSEYES | MASKCOVERSMOUTH

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

@@ -238,7 +238,7 @@
 		if(href_list["internal"])
 			var/slot = text2num(href_list["internal"])
 			var/obj/item/ITEM = get_item_by_slot(slot)
-			if(ITEM && istype(ITEM, /obj/item/tank) && wear_mask && (wear_mask.clothing_flags & MASKINTERNALS))
+			if(ITEM && istype(ITEM, /obj/item/tank) && wear_mask && (wear_mask.clothing_flags & ALLOWINTERNALS))
 				visible_message("<span class='danger'>[usr] tries to [internal ? "close" : "open"] the valve on [src]'s [ITEM.name].</span>", \
 								"<span class='userdanger'>[usr] tries to [internal ? "close" : "open"] the valve on [src]'s [ITEM.name].</span>")
 				if(do_mob(usr, src, POCKET_STRIP_DELAY))
@@ -246,7 +246,7 @@
 						internal = null
 						update_internals_hud_icon(0)
 					else if(ITEM && istype(ITEM, /obj/item/tank))
-						if((wear_mask && (wear_mask.clothing_flags & MASKINTERNALS)) || getorganslot(ORGAN_SLOT_BREATHING_TUBE))
+						if((wear_mask && (wear_mask.clothing_flags & ALLOWINTERNALS)) || getorganslot(ORGAN_SLOT_BREATHING_TUBE))
 							internal = ITEM
 							update_internals_hud_icon(1)
 

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

@@ -77,6 +77,12 @@
 		s_store,
 		)
 
+/mob/living/carbon/human/proc/get_internal_slots()
+	return list(
+		head,
+		wear_mask,
+		)
+
 //This is an UNSAFE proc. Use mob_can_equip() before calling this one! Or rather use equip_to_slot_if_possible() or advanced_equip_to_slot_if_possible()
 /mob/living/carbon/human/equip_to_slot(obj/item/I, slot)
 	if(!..()) //a check failed or the item has already found its slot

code/modules/mob/living/carbon/life.dm

@@ -304,11 +304,21 @@
 	return
 
 /mob/living/carbon/proc/get_breath_from_internal(volume_needed)
+	var/obj/item/clothing/check
+	var/internals = FALSE
+	var/internalslots = list(
+		head,
+		wear_mask,
+		)
+
+	for(check in internalslots)
+		if(CHECK_BITFIELD(check.clothing_flags, ALLOWINTERNALS))
+			internals = TRUE
 	if(internal)
 		if(internal.loc != src)
 			internal = null
 			update_internals_hud_icon(0)
-		else if ((!wear_mask || !(wear_mask.clothing_flags & MASKINTERNALS)) && !getorganslot(ORGAN_SLOT_BREATHING_TUBE))
+		else if (internals == FALSE && !getorganslot(ORGAN_SLOT_BREATHING_TUBE))
 			internal = null
 			update_internals_hud_icon(0)
 		else