The RAF Blue Polka Dot Scarf is 100% silk and measures approximately 20 inches by 20 inches. The RAF often wore a blue polka dot scarf / neckerchief as seen in numerous WWII photos.
To keep a pilot’s neck from chafing against the wool of his collar, they’d use bits of silk or parachute.
Note: This is just enough to tuck under the collar. It’s not a full-length fliers scarf.