The Kerrie flip flops are a bit smaller than most coach shoes. I recommend that you go up a size, because they are snug. As far as flats are concerned, I typically go down a half size. Sneakers, wedges, and heels run true to size. Other sandals, boots,and clogs run true to size as well. However, if you have wide feet, which I do, you should try them on first. Some styles are more narrow than others. But even if you do order online, it is no big deal, because you can always exchange them. Good luck with your shoe shopping.