Down Town
I was walking behind an attractive young woman into an outdoor mall downtown. She was wearing a T-shirt and this intriguing short black gathered skirt. A gust of wind caught her skirt and exposed her entire bottom. She certainly wasn't wearing any panties! She didn't seem to notice that the wind had blown her skirt up.
My closest experience would be Donald Ducking in a longish shirt. The feeling of the fabric dancing in the wind against the skin is certainly pleasant, but I'm not sure how long between touches would make me think the wind has completely lifted the hem. Eventually the lack of the fabric dance means there's only one possible conclusion. Perhaps she suspected it but has no interest in looking panicked but trying to do something about it. That's confidence. :-)