noun
unbuttoning a collar; opening one's collar
Refers to the act of loosening or unbuttoning the collar area of clothing, often for comfort or style.
暑い日は開襟してネクタイを緩める。
On hot days, I unbutton my collar and loosen my tie.
He answered our questions with an open-hearted attitude.
noun
Abbreviation of 開襟シャツ. Refers to a shirt with an open collar, typically worn without a tie.
See also: 開襟シャツ
今日は開襟で出社した。
Today I went to work in an open-necked shirt.
Full form of the abbreviated sense 3; explicitly refers to an open-necked shirt.
Compound of 開 (kai, 'open') and 襟 (kin, 'collar'). The metaphorical sense 'open-hearted' derives from the image of opening one's collar to reveal the chest, symbolizing frankness.