This is the shaggy felt that was used for the trapper hat lining in my Woodland Snowman Ornie pattern. The color is white, but you can tea stain it for a more prim look (see pic below - the original white color is in the background) - you can really see the looped texture when stained:
Fabric is 45" wide & sold in 1/4 yard continuous cuts (order 1 for 1/4 yd cut, order 2 for 1/2 yd cut, order 4 for 1 yd cut...)
I would estimate that you should get around 10 of these trapper hats per 1/4 yard.
Note: Shaggy Felt has been discontinued by the manufacturer so it's only available while supplies last.