My sister is obsessed with buying tons of super cute shoes and is always kindly passing on the ones she doesn't wear anymore to me. The trouble is, she wears a 6.5 US and I'm closer to an 8. I always try to cram my feet into them and sometimes they'll stretch, but sometimes they just kill my feet or some have even broken Anyone have a similar problem? Any ideas on how I can stretch them to fit my feet?