https://www.torrid.com/ (edit: i guess torrid doesnt have much for socks and stockings directly but i will leave it)

I used Torrid to get shoes, i have feet that just dont quite fit in standard lady sizes and i literally kept sending them back until i found the right size. Great store, look for sales. They use a couple of gimmicks to save money.

Also bought fleece leggings from them and they fit great. Good luck!