Some have dressing rooms, and others don't... Here's my secret to making the best purchase each time!
Wear a simple Thrifting Uniform!
Anything form fitting or sleek will do the trick. Typically, I wear leggings of some sort and a tank or tee. It might not be the most glamorous outfit ever, but it helps alleviate the "No Dressing Room" issue. You can just try on your clothes in the middle of the store!