New elastic back flats are too small... help with stretching?

  1. I just bought some of those Tory Burch elastic backed flats online and they are just too small. The elastic seems really tight, even though I ordered my normal size. Anyway, I thougt they would stretch out if I wore them around a bit, but they aren't budging. I'm getting huge indentations at the back of my heels! Does anyone have any ideas on how to stretch these?

    The elastic is sewn in, so I'd have to take a seam ripper to the shoes to get at it.

    I can't return the shoes because I've worn them. I've just been contemplating selling this pair on eBay and getting new ones. Any other ideas?