noun
large primitive bamboo hat
A traditional wide-brimmed hat woven from bamboo or similar materials, historically worn by travelers or workers for sun and rain protection.
時代劇で旅人が番匠笠をかぶっているのをよく見かける。
In period dramas, you often see travelers wearing a large bamboo hat.
笠 is the general term for a traditional Japanese hat or headpiece, while 番匠笠 specifically refers to a large, primitive bamboo hat.
Compound of 番匠 (banjō, 'carpenter' or 'builder') and 笠 (kasa, 'hat'). The exact historical derivation is uncertain, but it likely refers to a hat style associated with craftsmen or laborers.