I got an xs and it was true to size.
I didn’t take any form of payment in with me to the mudder. Our mudder was super muddy as it had rained all week prior. Instead of going back in once I got to my car (which got stuck in the field). I ordered online. Had the top within the week. I’m a Fabletics member so I already knew it would be great quality. I get compliments on the tank each time I wear it!