....yeah, I've tried the law and park ranger sources but so far nothing. I did come across a UK ebay site that has the later style brown wool battle dress jacket (with the buttons exposed). I sent a note asking WPG about the cost of the RAF blue jacket alone (w/o the pants) but they never replied so I guess they are too busy.

But, in answer to the original questions, the first picture I ever saw of a kilt and battledress jacket was, I believe, a picture of "Monty" in either N. Africa or at a conference with Eisenhower and the other top generals. He was in kilt and jacket.