I bought the batman zentai suit not knowing how it will fit to my body. So, I'm 5'8 and 142lbs so I'm on the slim side 30'' waist. I got the medium size not knowing if it would be baggy on me or not. But, once I put it on it was nice and tight on me; it fit almost perfectly. I had a little extra room for my fingers but not really noticeable, and I had an inch or two in the crouch area, which really wasn't a big deal. Although you might want to consider wearing a cup or something, otherwise it's a noticeable bulge and could be awkward at a party. It has a dual zipper which starts at the back of the mask and goes to the bottom of your back which is a little hard to do by yourself, but if you have your sidekick or Robin you'll be fine. Overall, it is awesome!