So I have been watching this on Masterpiece Theater and have noticed that the your Crown Prince is often seen in a kilt. But ponce line in last weeks episode made me wonder. There was a discussion about what the royal family would wear to an event and the Queen said something along the lines of "of course Bertie will wear his kilt, the Prince of Wales must be recognized".

Since I tend to think of the kilt as a Scottish thing, and not (at least historically) a welsh thing, I wondered if this was just an odd line by the writers or if there is some traditional reason for the prince of wales to wear a kilt?