DSF

I picked up some stock which contained items i have never printered before (either sub or vinyl), some of them are baseball caps made from wool and viscosse, obviously cant sub them, but im a little confused what i can put on them, any ideas? Do certain vinyls stick to wool/viscose? If so i havent havent come across it yet :s

any help much appreciated.

woolen ones I would presume for embroidery only.