1.
open collar; open-necked style
A shirt or garment style with the collar worn open, without a tie or buttoned-up neckline. Refers especially to the open-collar dress shirts commonly worn in summer in Japan.
Combines 開 (open) + 襟 (collar). Most commonly seen in the compound 開襟シャツ.
Watch out
Do not confuse with 解禁 (lifting a ban), which has the same reading but different kanji and meaning.
Common collocations
Cultural note
The 開襟 style became widespread in Japan after the government launched "クールビズ" (Cool Biz) in 2005, encouraging office workers to dress casually in summer to reduce air conditioning use. During the Cool Biz period (typically May–September), wearing an 開襟シャツ without a tie is standard in many workplaces.