From another list:

"WalMart in my area usualy (not always) carries socks in the
13-15 size, 100% cotton, crew style. I don't remember the
brand, but it's marked as being 'plus sized' or some
similar. I have similar issues with man made materials,
though not as bad, and these are 100% cotton, and I know
they're crew style, because tube socks irritate my toes,
with the seam runnung across the front, so I don't wear
them."