Pleats tied to formality?

[creagdhubh]

I concur. When in the company of kilt-conscious people who know the difference between a traditional kilt and a modern "casual" kilt, the higher yardage knife-pleated kilt is perfectly at home in all settings (i.e. all levels of dress). A casual kilt will look oddly out of place in dressy situations.

But the choice of pleating (line/stripe, sett, etc.) really doesn't make any difference.

I couldn't agree more, Tobus.