In male shoes, I wear a 10.5EEEE or 11-11.5XW, so for finding a pair of women's shoes, it usually means that if it fits in the width, the length is off. Ebay, I got a 13W that fit perfectly, but with payless- I've had 1 pair (size 13M) out of 3 not go back (ordering online) as they were cut different. One had an extra inch to the length but the width was amazing, while another was perfect in the length but a tad too narrow. I tried using the '13W=12.5WW=12XW=11.5EEEE' trick with maybe 50% success. Would I be better off buying a smaller size and stretching it a bit?