One size fits most... broomsticks.

I purchased several of these for a group Halloween party. With the exception of one thin woman, they were too small. The packaging says that these will fit men with up to a 44" chest. My brother found it too tight to move comfortably, and he's only a 38. The fabric stretches a good deal, so you could squeeze a larger man into the costume, but he will look more like an overstuffed sausage than a medieval monk. If I had time, I'd return them, as it is, I'm going to have to get creative to make them work.