Your best bet is probably to make friends with a knitter. Double knitting is doable, but takes more time. I mostly knit with a merino/cashmere/nylon blend (I find mohair itchy). Seriously! Even Smartwool hats seem to be 50% acrylic now. I wonder whether you could find someone who would make something to your requirements on Etsy? I bet it wouldn't be much more expensive than purchasing a good quality item from a retail store.
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