I was a bit socially awkward as a kid, and when I got invited to hang out with a b-list cool kid one summer, I couldn't believe my luck. Mom took me shopping for a new bathing suit and sent me off for some fun. It was a great bathing suit... turquoise and pink one-piece, with a flattering cut for my tentative 'tween figure.
As we were getting ready to go to the pool, my social-ticket friend saw that bathing suit and said, "Hey, why don't we trade suits... I'll wear yours and you can wear mine." Now, let's not even think about the hygiene issues, because there weren't any in those days. Just focus on the dilemma: brand new bathing suit ... potentially important friend.