Try on a pair of leather, snug-fitting, hard-soled dress shoes at a store while wearing dance socks. If the store sells non-Irish dance shoes, such as jazz shoes, try those on.
The shoe should be be very tight, because Irish dancing shoes are made of soft leather that stretch a half size or more. If choosing between two sizes, select the smaller size.
If the shoe fits properly, look at the box. U.K. sizes are listed alongside U.S. sizes. Write down the U.K. size of the shoe. The U.K. shoe size will be a smaller number. For example, a U.S. ladies' size 8 will be a U.K. ladies' size 7.
Children should try on shoes in the same manner, but go up a half size to allow for growth. Do not select a shoe more than a half size larger, or the child's foot will slide.