they do not fit true to size, but one should size up. I'm pretty much a standard XS in most clothing, but with these I could barely zip up the fly (I'm not curvy at all). Forget trying to button it up, one time I did I had the most hideous looking muffin top you can imagine!! being active in that state? not so much...
They are well made, and I love the accent colour, but they really are fit very small. I had to return them.