So the waistcoat is sewed, hemmed, what now? Fastening:-)
Decorative one, in this case.
I sewed a narrow rectangle around each mark. The buttonholes are quite long.
I cut each one (not the stitches). Then I embroidered each one with overcast stitch.
And what cotton did I use? These are threads I pulled out of the fabric!
I marked the buttons opposite to the buttonholes and sewed each one on.
The completed costume.