Mildly derogatory slang to describe a class of female attire, and the women that tend to accompany it. Specifically, those who dress up (or overdress) for parties, special occasions, etc. in a standard sort of uniform: little black dress (or variant outfit), string of pearls, expensive shoes. Usage: "Are there going to be cool people at this party, or just a bunch of girls with pearls?"
Contrast: girls with guns.