"It's snowing down south."

This was a commonly hear phrase when growing up. Underwear was hidden - never seen. I used to sew holders at shoulder seams to keep errant bra straps in place. Though it seems years since I ever heard the saying - once SO common place - hey! it's snowing down south! - this meant you slip/petticoat was showing below your hem. Unforgivable! Slips/petticoats were usually always white, hence the 'snow'. If you had a black slip, if it showed it seemed noone said anything to you as it was considered a bit risque, and to let it show was 'advertising'.