To achieve that circular edging, I have used pinking shears For the outside edge and a simple punch for the holes.
As a Scot Who wears a kilt daily, I would be remis if I didn’t remind you that a “hunting” sporran would never have a metal cantle or tassels which could make noise when hunting. Instead of the 3 tassels, hunting sporrans have 5 “leaves” that are tacked down so that they do not flap.
RC
Honolulu, Hawaii.