removing one's hat; admiring (someone) greatly; taking one's hat off to
regulation cap; school cap
red cap; (railway) porter; redcap
three-cornered hat; tricorne
mitral valve; bicuspid valve
mortarboard; trencher; (square) academic cap formerly worn by Japanese university students
flat cap; cloth cap; newsboy cap; (hunting) cap
aviation cap; flying helmet
field cap (used by Japanese troops in WWII)
safety helmet; crash helmet; hard hat
hat worn by kindergarten or primary school pupils walking to school
shabby clothes and an old hat
red and white reversible cap
hat; headgear; traditional cap worn by Shinto clergy and courtiers