I am broad in the shoulders and sometimes I take a larger women's size in cycling clothing than I do in regular clothes. I can wear a men's small but often they are too long and hang over my rear in a way that the stuff in my pockets bounces around too much. I guess it is a matter of trying different brands too see which fits the best. The reality is that I have sizes of regular clothes that range from 0 - 8 -- right now I am mostly a 6, but it seems to depend.