Question 1: Felt hats can be stretched for a custom fit, and hard hats (such as Derbys and ________) have a hard goss which can be melted to adjust size.
Question 3: Brim, an optional projection of stiff material from the bottom of the hat's crown horizontally all around the circumference of the hat wide brim, ________ brim (dimensional brim), curled brim, rolled sides, etc.
Question 5: Crown, The portion of a hat covering the top of the head open crown, center crease, (modified) ________ (-crown), tapered crown, un-tapered crown, teardrop crown, telescope crown, off-kilter telescope, pecan top (porkpie), flat crown/straight crown (e.g.