Wikipedia:
A cap is a form of headgear. Caps have crowns that fit very close to the head and have no brim or only a visor. They are typically designed for warmth and, when including a visor, blocking sunlight from the eyes. They come in many shapes and sizes.
Types of caps
Boston Celtics capAscot capAyamBalmoralBaseball capBeanie (North America)BeretBirettaCap of MaintenanceCasquetteCaubeenCaulCoifCombination cap (also known as a service cap)Cricket capDo-ragDutch capEngineer capFezFiddler cap (also known as a Dutch boy hat)Fitted capFlat capForage capGandhi capGarrison capGlengarryGreek fisherman's capInternational capJohn Lennon capJuliet capKepiKippah (also known as yarmulke)Kufi (also known as a kofia; an African cap worn with a dashiki)M43 field CapMonmouth capMuir capNewsboy capNightcapNurse capOchipokPapakhiPatrol capPeaked capRastacapSailor capShakoShower capSindhi capSquare academic capSwim capTam o' ShanterTaqiyah, worn by Muslim malesTrucker hatTubeteikaTuque or stocking cap, wool cap, watch cap, ski capUshankaUtility coverWelder's capYachting capZucchetto
