帽子 is the general term for hats and caps of all types.
COMMON EXPRESSIONS:
- 帽子をかぶる: to wear a hat
- 帽子を脱ぐ: to take off a hat
- 帽子を取る: to remove one's hat (polite gesture)
TYPES OF HATS:
- 野球帽: baseball cap
- 麦わら帽子: straw hat
- ニット帽: knit cap
- ベレー帽: beret
COUNTER:
個 or つ for counting hats.
CULTURE:
Removing one's hat indoors or during greetings is considered polite in Japan, similar to Western customs.