We went through the stage in school where it was cool to wear something that was your boy friends. One girl had her boyfriend's school jacket, one wore his sweater. Of course people wore rings and hats and things like that ... my brother settled on wearing his girlfriends underwear but I am not sure she gave it to him or even knew he wore it.
My sister in law wore my brother's jeans when she was pregnant. He was a skinny stick. We all hated her. She looked like she had a bit of a bloat at 8 months, I looked like a beached whale. I wore a tent and was happy to get any colour other than canvas brown. She went from a size 2 - to a 4 and I am not sure how she ever got over the humiliation.