Someone on Facebook recommended the Etsy shop Suedeshop as a good source for Ultrasuede for finishing.
Note that Suedeshop sells three types of Ultrasuede: LT, HT and Sensuede. LT is light weight, HT is upholstery weight, and Sensuede is microfiber made from recycled plastic. I know HT is hard to sew though unless you have a heavy duty sewing machine, so I always prefer the light weight LT Ultrasuede. I don't know how easy Sensuede is to sew through either by hand or with a regular sewing machine but I'm sure the shop owner can guide you.
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