Back on the rack

Seems unlikely she kept her underwear on, either. Or she's wearing a g-string, which, in this scenario, is pretty much the same thing.
Dressing rooms are fun

This is why they tell you to keep your undergarments on when your try on swimsuits, kids.

Always assume the clothes you are buying were tried on by someone else (because they most likely have been) proving that buying stuff used is just as good