Ryan Dolan of Carnoustie Backhold Wrestling Club was floored after he was disqualified from the 14-stone wrestling section at the annual Lakeland Sports show in the Lake District. He would not submit to shedding the garmment to make the weight.
William Baxter, the president of the International Federation of Celtic Wrestling, said: "At the unofficial weight-in he was under 14 stone, and everything seemed okay, but at the official weigh-in disaster struck.
"He was overweight wearing his kilt.
"That is fine for the English who compete in tights and florally embroidered silk vests, but the Scots compete wearing the kilt and when he was told by the officials to take off his kilt to make the weight he refused and was disqualified.
However, Mr Dolan went on to compete in the all-weights 'open' section and won, taking the £200 prize.