This is the alien facehugger winter mask hand-knit and sold by Etsy seller Knitrocious ($150). It looks pretty accurate. Plus nobody will think you're weird for wearing it. And if they do, send them over to my place and I'll answer the door wearing nothing but a gas mask and banana hammock (plus revving a leaf-blower) and they'll have to reevaluate their definition of weird.
Thanks to Canton, who wears a chestburster vest to stay warm in the winter but if you only see it out of the corner of your eye it looks like a penis.