I was in Target with the nine-month-old I nanny for. My sweatshirt was apparently pulling my my teeshirt so that about an inch of my lower back was exposed - no butt crack, just lower back. I tugged at it most of the day, but in between tugs, an older woman approached me and said "Excuse me ma'am, but your rear end is hanging out and frankly you're just too fat to be going around like that."
My jaw hit the floor. I said "Thank you. I'll give you a thirty second head start. You should walk away now."
Real great confidence booster before my dress fitting tomorrow.