We had a bit of deja vu with this oddly striped dress, but we couldn't quite place it. Then Lauren Chiang emailed us with the same obsession, except she knew its roots: The dress may have turned up at Forever 21, at Mandee, at Strawberry, and on street corners, but it started last season on the Tibi runway. Net-A-Porter has it (at left) for $369. Meanwhile, we spotted it yesterday at a stall on Broadway for $10.99. That brought out another mystery: Was this dress really such a hit that it got girls craving knock-offs? We love Tibi, but we don't get it!