Agreed, total dislike on anyone. Really not sexy at all - it just looks careless. Same with builder's bottoms...never a good look on anyone. And whoever thought of "reverse cleavage" - those trousers / skirts / dresses that show off the dimple on top of your bum really should have their head examined! Having said that, I have issues with underwear poking out and it's mortifying! I have a rather lusciously huge backside and my choice is either buy trousers that don't fit the waist or leg, or remember to hoick them up before I sit down!
Can I add dislike of high street shops who either sell trousers so low slung there's nothing you can do to keep your pants hidden or so high they're under your armpits?