^I'm sorry if this sounds rude, but, buy whatever the crap YOU like. Who cares what other people think you should wear. Just go try some oakley crap on and see what fits you best. Personally medium fits me the best. So if you super skinny like me (I weigh 120 lbs) then get medium. If you're fat get XXL, it's not rocket science. These are your clothes, make your own statement, not someone else's.