Black velvet bow high heals

These are my favorite pair of heals I've ever bought but they are too big for me, I was hoping I could figure out a way to make them work, but can't. They have been worn once, out on New Years for quite a few hours that's why the bottoms are as dirty as they are. They say size 6 1/2 but I usually can fit a 7 in heels and they're too big so I said they are a 7.5. Price is negotiable.