headover

noun

1. A knitted garment worn on the head, somewhat like a balaclava.

   “The Baselayer Range of Thermal Sportswear includes Headovers, Balaclavas, Polo Necks, Zip Polo Necks, […]”

   “Skis, facemasks, headovers, oiled-wool hats and their outer garments were all Norwegian products, civilian style; their back-packs were all different, but similar to any other ski-trekking tourists' packs.”

   “According to instructions for the Kopfschutz, a pair of these knitted tubular 'headovers' could be worn together by pulling one over the head and down to the neck, and the other on to the head and over the ears.”