The Scottish Tartans Authority has decreed that refusing to put on underwear beneath a kilt is "childish and unhygienic".
It also warned that "going commando" flies in the face of decency.
Tartans Authority director Brian Wilton said kilt wearers should have the "common sense" to realise they should wear underwear beneath their country's national dress.The Telegraph
But Scotland's kilt wearers condemned the advice. Former Formula One racing driver David Coulthard, 39, of Twynholm, Kirkcudbrightshire, said: "Kilts are from the past and so is the tradition of not wearing any underwear. I'm proud to be a true Scotsman. It's a tradition that should be left alone.
"I've been wearing kilts since I was a little boy and will continue to wear my kilts in the time-honoured fashion. There is nothing childish or unhygienic about it."
Inverness-based kilt maker Ian Chisholm, a spokesman for the Scottish Kilt Makers' Association, said: "The tradition of no underwear being worn was a stipulation of Scottish military regulation.
"To say it is unhygienic is wrong. The freedom of movement is healthy. We always tell customers to wear nothing under the kilt if everything is in good working order."