Depending on how tall you are you might want to check your local sporting goods store for some socker socks. You may be able to find a pair is a color to compliment your kilt. Socker socks are normally designed to be long enough to fold over at the top.

If you sew or know someone who does, while at the thrift shop you might want to check for a jacket to make into a kilt jacket. Around here you can often get a suit jact for under $10 and Alan H has a good explaination on how to cut the jacket down.