If you're in your post collegiate days, you're keenly aware that you can no longer get away with cutoffs that basically resemble denim briefs. That's not to say that jean shorts aren't our single favorite summer apparel staple. Au contraire—we love them! But it's all about choosing the right fit and styling them like the sophisticated woman you are. So here are there are rules to keep in mind when shopping for, and subsequently styling, jean shorts: The Chestnut Hill, What the Chung, Girl…