I've put together Meowth's dress, paws, ears, and tail for a friend. I'm about to send Vileplume fabric off to another friend. And I'm making Zubat for myself. (all for the D*Con group)
I think fleece and flannel and other snuggly fabrics are appropriate for a lot of the Pokemon. I used off-white micro plush fleece and light brown fleece for Meowth. Vileplume is kind of flannelish, I'm not exactly what it is since I bought it off a clearance table years ago. And I'm using turquoise and purple fleece for Zubat.