the.com/stocking cap

means A long, soft, tapering knit cap, often with a tassel or pom-pom at the tip, traditionally worn for warmth in cold weather or sleep.

from Named simply for its resemblance to a stocking — the long knit tube that once covered legs got borrowed in shape for the head. Knitted nightcaps of this elongated, floppy style were common from at least the 18th-19th century onward, worn to keep the head warm in unheated bedrooms. The 'stocking' comparison stuck because the cap's long, droopy, knit-fabric shape really does look like a sock stretched out and pulled over the head, tassel standing in for where toes would be.