Here's the jacket I made from Style 2514. I had put silver buttons on it, but didn't like them, so have made some covered buttons from leftover fabric scraps.
I ironed a circle of very light weight interfacing onto the fabric before making the buttons. This added a layer of opacity to the fabric so the white button blank did not show through as well as helping to stabilise the soft wool fabric and reduce fraying. I used 22 mm button blanks.