I know what I want, but I'm not even sure it exists! Probably mainly cotton rather than poly, but I'm open to any suggestions. The only thing I can think of is loopback sweatshirt stuff, but in a light weight - but I'm not sure that's possible. I did wonder about ponte, I've heard of it, but dunno what it feels like, is it a bit sort of stiff? Or is that "scuba" I'm thinking of?