I love this shirt. I don't plan on wearing as a sleep shirt, but to the Disney Parks on our upcoming trip.

This tank is really cute and can be worn anytime, not just for bed. It is 'oversized' in that it's wider than most tanks, but mine did shrink some too. I didn't think it would from the fabric description, but it did. I got a small, and am only 118 lbs...thank goodness it wasn't 100% cotton!! It still fits really well, a little flared at the bottom and the arm holes aren't hangin down. But you may want to consider some shrinkage when getting your size.