Q: Who has time to think about an entire new uni wardrobe? A: Not you, girlfriend. Lucky, then, that this season’s hero piece — the slinky slip dress — works for pretty much every occasion. Classes? Check. Gal-pal lunch? Sure. Big night out? You betcha. In other words, it's perfect for your back-to-uni game. See how these #AsSeenOnMe stars are rocking theirs and shop your fave…