When I first got my kilt it was for my wedding, so I bought a PC/waistcoat to go with it.

Not long thereafter I realized I needed something I could wear more regularly, so I bought a navy blue Barathea Braemar/Argyll from Geoffrey (Tailor). (In retrospect, I might have gone with a dark green to pull that color from the Mackenzie tartan in my kilt; I should also have picked up a waistcoat, but I digress....)

While it's certainly a step down from the PC, the Braemar is still a little formal -- especially for daywear -- so I don't consider myself to have a proper day jacket just yet. Then again, I haven't had much occasion for one, so it hasn't been a big deal....

When the time comes, I'll probably aim for something in tweed, which should be plenty versatile.