I Mustache You Not to Steal Your Brother's Clothes

Old Navy had one of their mega-sales and I picked up a cute gray mustache sweater for Alex. I had to go out of town and while I was gone, Abigail discovered the sweater, talked her brother out of it and snagged it for herself. Her brother is 9-years-old and wears a 10-12. She is almost 16 and wears a ladies XS. Same size, I guess.

She paired her brother's sweater with a cute scarf and made it her own.

So, do you call this a "hand me up?"