Depends in your taste in style and the type of clothes you wear. If you could coordinate based on the color of your suit, shoes, or if your suit is neutral and you are in a dress casual setting...your tie. I have a beige suit...pretty neutral...so I often color match the socks to my tie. I like purple undershirts and ties..so I have a few pairs of purple socks. Just don't wear socks that look stupid...socks are probably the least important article of clothing outside of underwear.