Sizes vary from label to label and style to style more than any other article in the feminine wardrobe. As a rule of thumb: take your masculine shoe size, then for an open-toed feminine shoe, add 1/2 to 1 size. For a closed-toed shoe, add 1 to 11/2 size. A solution for this problem is, when ordering shoes from a mail order house, to include a tracing of your LEFT foot and they will select the correct size for you. But, using the above information you will have an approximation of the size required so be sure the shoes you’re ordering are available in the size you need. Be careful when faxing a tracing: many fax machines will distort an image, so it’s best to include a line with actual-size inches marked on it right on your tracing.