Buckles would most definitely go with your new jacket. You already have the full length diced hose, by the look of your pic. They are meant for full evening dress, as is your doublet. Usually buckles are worn on a "bar buckle" type shoe, like the one in the picture.

I've never seen buckles attached to Ghillie Brogues in real life, but there are vintage photos of older generation, (Victorian & Edwardian) , kilt wearers doing so. Maybe nowadays not many would notice the difference, to be honest. The Irish guards wear buckles attached to ordinary brogues via a plastic tongue that fixes under the laces.

To buy an actual pair of buckled brogues is a very expensive business. There are few makers nowadays. There are a pair on Gumtree over here at the moment for £70, which is cheap. They are exactly my size, but, like your doublet, I doubt I'd have much opportunity to wear them.

I have two pairs of shoes I wear with my kilt, an army issue pair of thick bullhide brogues that I've had for well over 20 years that will last longer than I will, and a pair of Ghillie brogues that are thin leather, but comfortable. I think they went by the brand name "The Piper". I've certainly marched quite a few miles in them without too much problems with comfort.