This is a free pattern:

DIRECT PATTERN LINK

Designer’s notes on sizing:

If your wrists and hands are on the larger side, I suggest following the number in parentheses. If you are not sure you may want to try knitting in the round 20sts for seven rounds and seeing if you can fit your hand through. As long as it’s not uncomfortably tight, I recommend Casting on 160sts since alpaca tends to stretch; if it’s really tight, Cast on 200sts instead.