I use a standard suitcase. Kilt rolled. If bag less than 24" then kilt carefully folded. Jacket folded half-inside-out as with suit jackets. So, nothing special for luggage. Just make 'good sense' packing. I've not had any problems regular or kilt attire.
I've no idea of the link anymore ..Harry Rosen maybe? .. that gave tips on how to pack a suit for travel. I basically used those principles.
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