noun
double-buttoned
Describes clothing, especially jackets or coats, with two parallel rows of buttons; a style often associated with formal or classic tailoring.
彼はダブルボタンのスーツを着ている。
He is wearing a double-buttoned suit.
このコートはダブルボタンで、とてもクラシックな印象だ。
This coat is double-buttoned and gives a very classic impression.
シングルボタン refers to a single-breasted garment with one row of buttons, while ダブルボタン has two rows.
Loanword from English 'double button', referring to a double-breasted button arrangement on clothing.