I wear a Med in most tops and size 6 in slacks. In this top, an xlarge fits quite nicely. Of late, Nike makes most tops cling, which for the majority of anyone over 19, is less than flattering. Some, who must never look in the mirror, wear the tops oblivious of the rolls/muffin tops. Nike would sell a lot more of their adorable on the mannequin clothing if they would just relax the fit.