When I've travelled with my kilt kit, I find it easier to take my box pleat 16 oz rather than the knife pleat, because there's so much less cloth. Take a modest sporran (no horse hair to pack!) one pair of versatile hose and a safety sghian or none at all to avoid local legal restrictions. A jumper is easier to pack than a jacket, but you may need a jacket depending on what you're planning to do. Shirts and ties are just... shirts and ties. 
Beyond that, when you fold the kilt... well, I don't. I roll it. I've had a lot of luck rolling it and then not putting it in the suitcases, but sliding it into the case for a camera tripod which can go as a separate carry-on.
Just a few thoughts for you!
Rev'd Father Bill White: Mostly retired Parish Priest & former Elementary Headmaster. Lover of God, dogs, most people, joy, tradition, humour & clarity. Legion Padre, theologian, teacher, philosopher, linguist, encourager of hearts & souls & a firm believer in dignity, decency, & duty. A proud Canadian Sinclair with solid Welsh and other heritage.
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