Picture borrowed from HoS website without permission

Err... Black, Charcoal, Navy Blue, Ancient (or Lovat) Blue, Claret, whichever you prefer. White or Cream (Ecu) would work as well but it won't be the popular choice.

W Brewin & co. who trade on ebay as WB Socks are a good source for budget kilt hose. So are Heritage of Scotland and Scotland Kilt Company.