I've seen pipers wear trews... although they weren't competing at the time.
Aye, Blu is 100% correct...and since the Second World War, all Scottish soldiers have worn trousers as part of their military uniform, since the kilt was abolished for the combat uniform during WWII.

If you ever see the movie "Tunes of Glory" with Sir Alec Guiness, which is about a Scottish regiment after WWII, the only people wearing kilts are the officers (who can afford to buy them!), the pipers and drummers of the band, and the civilians invited to the Battalion cocktail party - all of the other ranks shown in the film are in trousers -- the only thing that id's them as Scots are their bonnets (T-o-S) and the small square patch of tartan on their shoulders.

"Tunes of Glory", btw, is the BEST Scottish movie of all time, INMHO, and a "must-see" for any kilt-wearing gentleman! :mrgreen:

Cheers,

T.