Runs small, size 7 (I think size 6-8 was his choice) for my 6 year old fits very well wash well before washing. It's a muslin-like material and I'm sure it will shrink with washing. Also, since it's skin tight, we have to wear a white t-shirt underneath so you don't show your flesh when the buttons come undone (think of the problem with women in button-down shirts). There wasn't enough detail on the sizes and other reviews. I would definitely go up the size one. It's mainly for single wear so will be fine but I'm disappointed that it's not wearing out anymore.
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