I loved the tips in the class. I try to also wear layers when I shop. I find that a tank top and flowy skirt are your best allies.

The tank top is a great barrier if you are unsure about the cleanliness of the clothes you are trying. And you can try a shirt over it in a few seconds.

Flowy skirts are also awesome to wear thrifting since they are super easy to get out of (especially compared to tight fitting pants). And things should be easy, especially if you visit more than one store.