First, the specs: I'm 5'2", 150lbs, exceptionally short torsoed. Waist 30", chest 39.5"/34D. I wear a size 8-12 in most women's clothing, a 10 or 12 in fitted and sized shirts.
Now, in the fine tradition of bathroom mirror photos... (no, I don't know why the colour of my wall is so varied. It's actually off white. The shirts themselves are at least similar to real life.)
So you want to destroy my chainmail? was my first woot shirt, and is pictured here being incredibly wrinkled. It's a Men's Small and fits fine. Like most men's shirts, though, I find the cut to be boxy. I'm short but quite curvy, so having it fit nicely in the chest and a little tight across the hips/lovehandle area plus being loose at the waist is kind of off-putting. All woot shirts are too long on me, but I actually like that in a t-shirt, so no complaints here.
My mom got one of the Be The Monkey shirts the first time around, and decided it was too small/tight for her, so I was excited to get it. It is a Women's Large. I love how this fits: very comfortable, fitted without being too tight. However, I'm absolutely terrified of it shrinking or of me putting on a couple of pounds. I know AA shirts are known to shrink, so I'm being super careful with this one when washing.
This one isn't a woot shirt. It's from threadless, which uses the same cut of women's AA tees as woot; since I won't have the rest of my woot shirts until January, I thought I'd substitute for size purposes. It's not pulled down all the way in this photo--it's actually quite a bit longer--and is a Women's XL. I love this one best of all the sizes. It's not much larger than the WL, but the small difference makes me a lot more comfortable about being accidentally unkind to it when laundering. It fits nicely and is neither too tight nor too loose in any odd places.