After a quick 'Google' of socks (and a slightly irrational love of them) I noticed a couple of things that might help you.
-Unless there is a fold in the top of the sock (the part above the ankle) the width of this section tends to be less than the length.
-The heel and toes of a sock tends to be a bit of extra material making this part stick out so it might help to change the angle a little between both sections of the sock. Otherwise you could put the heel of the sock in, in either a different colour or a darker version of the colour you are using. I suggest that if you do this, a smooth curve would look great, it would be a nod in the direction of flat design. Though that is completely up to preference.
Hope this helps; when I think socks I think heels and toes :)