Recent postings regarding historic kilts got me to thinking. 17th Century noblemen in their kilts were not far from the non-kilted noblemen in their attire.

Notice the Dutch gentleman in black is not wearing a kilt, just the fashion of the day.
1661


The Frenchman in gold is wearing his cloak draped over his left shoulder, much like a fly plaid.
1663


The two differences I see are the tartan and bare knees; not much else.