These booties are amazing. They're beautiful, extremely comfortable and the rubber sole makes them "slip resistant".
But at first I purchased my usual shoe size, 8.5, and had to return them because they were waaaay too big. I then sized down to 7.5. At first they were a bit tight, but after wearing them for a day they had given in enough to fit perfectly. Half a size down would have been the perfect option, but it was not offered here on Amazon and, though I was able to find the size I wanted on other websites, they were way more expensive. Amazon's best price and their free return policies, paired with the extremely good quality of these booties, made everything worth it.