Definitely go down a half size or two. I didn't have the opportunity to trade them in before my trip so I can't give a totally accurate review of sandal size. The color was gorgeous and I was reluctant to let them go but since they didn't fit... something to keep in mind: my feet are very "flat" so where the t-strap meets the ankle band was about an inch or two "lifted" and so the sandals felt even bigger than from the too-big shoe sizing.