NB. In some cases we go from a more complex image() to a single icon_state string and I assume this works for every case but do not care to check because of the sheer scale of extra fiddly effort. Buyer beware, not my code.
Simply by changing it to the new labcoat variant that can be closed/opened.
Still created a proper definition for the old lab coat, /obj/item/clothing/suit/storage/labcoat, as it's inherited by custom gear.
This includes labcoats, IA jackets, first responder jackets, and the brown leather jackets.
This way, code for button toggling doesn't have to be duplicated for labcoats and other coats, and it's easier to add other types of coats that can be buttoned up if someone wants.
spookerton