In reply to David Coley:
I don't know how you'd find them, but I bet there's a little cottage industry of people making things like this at home at the mo. I can think of a couple of people I vaguely know from the Climbing Works who make their own climbing clothes.
I just had a rather beautiful merino wool beanie arrive in the post from a friend of a friend who works as a kayaking guide and has a sideline knitting them as a hobby. (It doesn't really earn her any money, but for each one she gets a few quid in profit and donates a few more to the RNLI.)
She usually has a long ol' waiting list but she's doing almost one a day just now instead of one every week or two - still not as a business really, just a side effect of being stuck in the house.