The American yarn e-store, Knitpicks.com, has two kits available for under $20 each to make "plaid" socks. Kit = yarn + pattern. If you add some extra yarn to your order, and knit the legs longer, the socks would make some showy kilt hose.

Kits are available in blue tones or a black-and-gray mix.

I have ordered from this company many times. Their products are first-rate.

http://www.knitpicks.com/kits-sample...rey-clone.html