My Braemar jacket came with the typical shiny, square, chrome buttons. Some of them had cotter pins but some didn't, so it wasn't practical to swap them in and out with alterations. My solution was to "antique" them with a thin coat of nail polish and I quite like the look.

I also got a vintage set of 3 buttons for my white paisely silk waistcoat off eBay. Sterling silver with mother of pearl inlays and cotter pins on the back. My waistcoat doesn't have holes on both sides so I just sewed them on.