All the above is good advice. I currently have only one kilt that I can wear. (The one that was made for me in 1949, has shrunk in the closet. (I am saving it for a grandson who is built like I was at that age -- bean pole!)

My tartan is mostly red, with green, light blue and yellow overcheck. I have three jackets, one Braemer, which does double duty as dressy morning/day wear with a solid colour four-in-hand tie. Sometimes with a vest (5 button)., "Semi-formal" (tuxedo) with a Prince Charlie style of vest and black bow tie.

A converted sport jacket in a light, plain weave navy blue wool with pewter buttons, and a black polyester twill "Ike Jacket" converted from a western style short jacket.

My next kilt is going to be the "old sett" of my clan which is mostly blue with a red and yellow overcheck. The three jackets will go well with it too. IMHO, colour is far more important than fabric in this case.

As mentioned before, just make sure the jackets are a reasonable fit before trying to modify them into kilt jackets.