I started doing this about a week ago, and have been vociferously complaining about the new uniforms. I've always worn a medium (I'm a 5'10" dude, for christ's sake!), but now have to wear a small shirt in order to not have giant poofs under my arms. You can bet every time the fats walk in, I start up about it. Their reactions are gratifying. The other thin person laughs when I do it; she definitely gets the joke.