@indemnifyme - Convertible clothes are fun! I used to have this top that converted a bunch of different ways. It could be a halter top, a kimono sleeved top, or a tube top. Unfortunately it wasn't very well made because it fell apart pretty quickly.
Anyway, my boyfriend has a convertible collar dress shirt he really likes. He's actually replaced the collar part a few times! The stand collar part comes completely off of the shirt, so if you get a stain on it or something you can just get a new one. It sure beats buying a whole new shirt!