If yes feel free to share your experiences.
Personally I have twice but this was a while back.
1) When I delivered pizzas on one delivery this hot latina
coed type bent over to get the 2 liter soda after she was already holding the pizzas in her other hand. She was wearing a loose tank top and I got an nice eyeful of medium but perky titties. Not that I hadn't seen tits before but seeing them when you aren't supposed to just seems to make it special (if they are hot, obviously I would not want to see some old hag sagging boobies).
2) When I was a teenager at a Donut shop this mid 20s asian woman came in (again with a loose tank top/no bra) and while I was sitting down at one of the tables I caught a glimpse of of her tits plus a nasty hair growth under her arm pit that I would have rather not seen.
The following two incidents I was the lucky witness to don't necessarily fall under the category of "accidental nudity" but they were inappropriate due to the setting.
1) Shopping in Beverly Hills, this hot blonde mid 20s woman was walking around shopping in a 2 piece yellow thong bikini. Well this may be perfectly acceptable in a beach setting I certainly wasn't expecting to see that on the streets of Rodeo Drive. Although I'm not complaining.
2) During College at the library this cute brunette student was at a pay phone and her short skirt rid up where you could see half of her ass (she was wearing a thong I assume since I didn't see anything that appeared to be bush). Anyways I wasn't the only one that saw this, these 2 other students(guy and a girl) were right behind her waiting to use the phone and got a good eyeful. They were smiling, gigling, and pointing but they didn't tell the girl who was showing more than she wanted.