Knitted clothes for martial arts?

They make knitted baby clothes. It's a matter of what fiber you use, and maybe how tightly you knit. I've only done light contact, and that was not hard on the outfit. However, I'd wonder about whether a regular (worsted yarn) knit would be just too warm to fight in.

Some hemp blends are very strong, and some hemp/cotton blends are also quite comfortable. I haven't tried to knit with it, but only have a few pre-made clothing items to base my evaluation on.