One and a half size smaller than Uk sizes
These are the best sleepers I have ever had! I love them. However, please be aware that they come in smaller than usual sizes. I have ordered size 6 and I had to return them as they did not fit. I have ordered a size 7 which fits just right and I believe size 8 might have been worth considering.. but size 7 seems to be ok, hopefully they will stretch a bit. Overall, highly recommended as long as you order one or two sizes bigger than your actual size ??