I use generic rock hackle feathers from the top end of the cape. I use 4 feathers.
2 groups of 2, faced, and matched.
Generic: I visit the equivalent of a USA county fair (ours is the BV <bulkley valley> Fall Fair), hit the poultry building, chat it up with the folks putting in barred rocks, and visit them on packing day, when the rest of the flock is dispatched to the freezer. I pay about 3.00 for the cape and saddle patches. Then comes the work:
salt, borax, staples, time.