I made my own balaclava following the idea posted above, with a polyester undershirt short sleeve. I did not sew the crown top.
it kept me nicely warm at night, since generally 90% (CORRECTION EDIT 10%, not 90%) of heat loss is from the head.
in the morning, I used the rag to dry out the condensation from the fog.
make sure you warn your camp buddies that you are wearing this. You will look like a bank robber or a psycho killer terrorist. because your bicep is smaller than you head, it reshapes your fat face, and you look insane. makes for good laughs and photo ops. I will not post my photo. be careful you do not get stabbed or shot if you forget it on your head and surprise someone with it.
wilderness mosquitoes can still bite through the thin stretched sleeve on your head.
Your friends are scared, but the bugs are fearless.
I like this MYOG. it is very functional, very cheap, very ghetto. I like it.