I'm looking for a trusted online source for grosgrain ribbon for bonnet construction. I need 1.5"/4cm wide ribbon.

The ribbon available to me locally, although washable and advertised for garment construction, isn't very comfortable. It's 100% polyester. I asked about petersham ribbon, but that drew a blank. I checked for a local millinery supply and couldn't find one.

After putting in 20 hours of knitting with really nice yarn I'd rather not cheapen the work with synthetic ribbon.

Thanks!