dullradiance- if you’re gonna ‘knit’pick :), knitting uses 2 needles but either crochet or knitting can use both fine or thick yarn. So yeah, most kippot are crochet, cuz its easy to crochet round, but they can be knit too
i’ve seen a number of men wearing the black knitted ones. It does seem to be between typical kippa sruga and velvet.