I would suggest sizing down because although the website says they fit true to size, I found that wasn't actually the case. The top was way too big on me and the pants were too long, so I had to roll them up in order to walk in them.

Do Skims stretch out?

They will stretch out more than you think. That said, once I squeezed myself into my Skims, they definitely did the job and smoothed everything out—whatever annoying stomach bloat I had was virtually deleted.

Do Skims bodysuits run small?

Going up a size was the best decision and made me realize that these bodysuits run between small and true-to-size, which is something to consider if you're looking to buy one.