On the Burberry website, they have these Check Slippers that are super cute. I want to get them, but I have two questions, and I am wondering if you can help me out. Burberry - CHECK SLIPPERS 1. Can they be worn as flats? 2. I wear a size 7, which is 37 in European. When I click 'Size,' it only says Small, Medium, Large and Extra Large. What would a 37 be? Small or medium?