Simple, you can't wear socks and sandals at the same time. plz fix

well socks are a "feet" tagged item and sandals are a "feet" tagged item too so similarly to you not being able to wear two pairs of boots one on top of the other you can't wear sandals on top of socks. This is not a bug for it to be fixed, it is the game's intended behaviour.

Having said that idk if red will want to make an exception for sock-like items in the future.