UFO tv classic - What's the matter with purple wigs ?

Wigs were very popular in the late 1960's, and Sylvia Anderson envisioned that wigs might someday become part of a UFO uniform. Sylvia designed the Moonbase outfits and the wigs, and has been quoted as saying that the purple wigs came about simply because she liked them!
There have been attempts to give the wigs some sort of scientific explanation, like they protect the wearers from electromagnetic fields caused from the Moonbase command sphere equipment. However, besides being rather farfetched, these explanations always fail to explain why Col. Foster never needed any protection while he was in command of Moonbase! I find these reasons enough to ask my girlfriend to wear one.