Hello! This is from the Fabletics team. We know that this question was raised over a year ago, but we would like to address it.

Our size guide might help: http://www.fabletics.com/womens/size-guide. Most of our products are true to size unless otherwise stated. Each style will have a corresponding size guide that you can refer to and the reviews can also give you an idea of how the items fit. Also, if in any case, you are not satisfied with your order, we offer hassle-free returns and exchanges on your purchases.

Pretty true. I wear a 18 in jeans and I get the 1x rather than the xxL. They are snug which is how I like them.