Oh man, this is my dream! My wife has done this for me a few times, (bent over to grab her bag, flashed her tits etc). The most memorable one I put in a post the other day, but she swears that one was accidental!
We even picked out panties together at the store a couple of years ago because she was going to start doing “accidental” upskirts in restaurants and stores etc, but that never came to anything, more’s the pity. I really need to try and work on her again with that one! I love the idea of a guy looking up her skirt or dress and seeing her panties. Huge turn on!