So I have a used men's large Desoto Riviera Trisuit - this is the model with the "snake zip" black and white checkerboard design. It is just too large for me around the chest - if anyone has a medium that is too small for them and want to trade let me know - doesn't have to be a Desoto model but does need to be sleeved.
I am 5'10" and 170lbs and 39" around the chest. Suit fits well lengthwise but I guess I'm not "built" enough around the chest.
Can send photos if you pm me.