Socks are some of the least expensive indulgences on an absolute dollar scale. However, on a relative scale, they can be some of the most expensive on a per use basis, with a 100% cashmere sock. The basic rule is to match the sock to the trouser, but do try and avoid black socks with black shoes otherwise it looks like you're wearing a black bootie.

Sock styling I will leave entirely up to you, however, once you move beyond the standard business dress rib sock that small patterns...