Polar fleece works, but the nape is not as forgiving as antron when it comes to seams and blending stitches.
Honestly though, Puppet Pelts actually have a section on their site called "Premium Skin Collection" where they have six standard skin colors that they keep in stock, ergo less expensive than their custom colors because they dye it in bulk. Most of their skin tones are $38 a yard. I use a lot of polar fleece and it works but you will find yourself having to re-pick the seams. before sewing with it, wash it on delicate and then cool air dry it if your clothes dryer has that function. That will loosen up the fibers a little more and make it a little fluffier.
https://puppetpelts.com/collections/premium-skin-collection