I honestly feel like all flats have a 'break in' period... The lambskin ones I have take at least 2-3 wears to feel 100% comfortable (without ANY irritation)Hi all - I got ballerina flats (lamb skin) in 39. My sling backs and espy's are also 39. The 39 ballerina flats fit in the store but are tight now. (The 39.5 slipped off). Will they stretch? I'm really looking fur everyone to say it'll be ok bc it's too late to return them!