Are the items different in royals such that the bathrobe took the role, or was the bathrobe always the better choice and sauna robes were just l33t?
Here are some old threads discussing it: https://www.neoseeker.com/forums/22593/t1161359-sauna-robe-bathrobe/ https://gamefaqs.gamespot.com/boards/924697-maplestory/50551660 It matters in Royals because of washing and because bathrobe really is better (speed + lower level). I had a sauna robe in gms though as I thought it looked cooler.
