This suit is great. I have bought one other cat suit in the past, it was Chinese-made and the torso was far too short (ouch).
Here are my measurements- Height- 5' 6" Bust- 34" Waist- 26" Hips- 36" Inseam- 30" Thigh circumference- 18" Upper arm circumferance- 10"
I ordered a small, if your measurements are the same or smaller, order a small. If your measurements are any bigger (especially if you are taller), order a larger size. WARNING: You may be termpted to get a smaller size because it is stretchy. Don't go smaller than you are because this suit will not look good. It does not suck anything in. It is tight but thin. It will show all of you, and getting a size too small will give you problems like wedgies (front and back) as well as stretching over the curve between your butt and your shoulders (making you look like a tube person).
I love this suit though. You can jump around in it, do squats, jumping jacks, sit comfortably, and not feel like you are about to rip the seams. it is well made. The zipper is heavy duty and it does wave in and out when you lean forward. It is nice to find a cat suit that doesn't have the zipper go all the way to the butt. if I had to buy another cat suit, I would by another one of these.