I was very tempted to travel kilted last weekend (going to a Highland Games in another state) simply because Highland Dress takes up so much room in the suitcase. Ghillies, thick hose, kilt, bonnet, sporran, and kilt jacket and a small carryon is nearly full. (I never check luggage, and travel with a single carryon sized to fit in the overhead bins.)

Simply wearing all that stuff would free up so much space!

But then I thought about the issues you've been discussing here and decided against it.

What we need is

The Travel Kilt
-wrinkle resistant for those cramped seats and long flights
-plastic buckles: no metal to set off detectors

and

The Travel Sporran
-no metal whatsover in sporran or strap
-special passport pocket
-pickpocket resistant closure