Accessories are now visible when attached

Uses overlays.

I was originally planning to use the SOUTH direction of the
icons/mob/ties.dmi image as the overlay, however this had problems with
the fact that those images are directional. Rather than override Move()
in clothing/under to reset dir to SOUTH whenever clothing with an
attached accessory was thrown or dragged, I thought it would be less
hacky to read the overlays from a separate .dmi.

code/modules/clothing/under/ties.dm

@@ -9,6 +9,11 @@
 	slot_flags = 0
 	w_class = 2.0
 	var/obj/item/clothing/under/has_suit = null		//the suit the tie may be attached to
+	var/image/inv_overlay = null	//overlay used when attached to clothing.
+
+/obj/item/clothing/tie/New()
+	..()
+	inv_overlay = image("icon" = 'icons/obj/clothing/ties_overlay.dmi', "icon_state" = "[item_color? "[item_color]" : "[icon_state]"]")
 
 //when user attached an accessory to S
 /obj/item/clothing/tie/proc/on_attached(obj/item/clothing/under/S, mob/user as mob)
@@ -16,12 +21,15 @@
 		return
 	has_suit = S
 	loc = has_suit
+	has_suit.overlays += inv_overlay
+	
 	user << "<span class='notice'>You attach [src] to [has_suit].</span>"
 	src.add_fingerprint(user)
 
 /obj/item/clothing/tie/proc/on_removed(mob/user as mob)
 	if(!has_suit)
 		return
+	has_suit.overlays -= inv_overlay
 	has_suit = null
 	usr.put_in_hands(src)
 	src.add_fingerprint(user)

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

@@ -501,6 +501,7 @@ proc/get_damage_icon_part(damage_state, body_part)
 		overlays_standing[UNIFORM_LAYER]	= standing
 	else
 		overlays_standing[UNIFORM_LAYER]	= null
+		// This really, really seems like it should not be mixed in the middle of display code...
 		// Automatically drop anything in store / id / belt if you're not wearing a uniform.	//CHECK IF NECESARRY
 		for( var/obj/item/thing in list(r_store, l_store, wear_id, belt) )						//
 			if(thing)																			//