This was my girlfriend walking up a flight of stairs the other day. Had her leopard-print thong showing loads but a longer top on. Plenty of times her top would ride up throughout the day, giving a great view of her whale tail.
Not much of a story - just my girlfriend crouching down to look in our letterbox. Her thong showed much more as she bent forwards to see inside the letterbox more but I didn't want to get caught taking her picture. The light was on her since a car was driving past at the time.