No, I don't order one size up. If I was taller, I might. It feels a bit 'snug' the first couple of times I wore it in the pool, but loosened up a bit in just a couple of wearings. If someone is quite tall (or short) it might be a good idea to get the 2 - piece style. Great suit! (Just wish they would use the same 'lining' in the front as in the back. - Of course, then I wouldn't have to buy a new one as soon!) I'm in Hydro Fitness classes 3 times a week. The suit lasts a couple of years - as compared to the other chlorine-resistant suits that don't even make it through one year.