bar top

A low-cut shirt, usually a v-neck, often with features such as one or more of the following: ruffles, sequins, lace, glitter, or other noticeable "flashy" elements. Often worn with jeans or, occasionally, a skirt, they are a figure-flattering yet relatively casual option for femmes or ladies looking to attract attention, be flirtacious, or express a mildly provocative style.

The slang appears to originate in Eastern Canada or the Maritimes.

"Are you going out with us tonight, Kate? You can borrow one of my bar tops."