I was at a job fair the other week (minimum wage fodder, as it happens) and I felt a wriggling in my top. I ignored it, but it wriggled higher & higher and I was finding it hard to concentrate. Eventually, I located the offending thing and gave it a good squeeze through my top and felt it pop. End of story. It was only when I later got out into the foyer that I got the chance to shake it out, whereupon a dead wasp fell to the floor. How the hell I wasn't stung is a mystery.
It either got there on the ride to the fair or it was there from the top having hung out on the line.