背広 (sebiro) means “suit” | MotiTan Japanese Dictionary

More examples

面接には背広で行きます。men setsu ni wa se biro de i ki ma su

I will wear a suit to the interview.

It denotes a matched set of tailored jacket and trousers worn as a man's formal or business outfit.

スーツsūtsu: A matched jacket and trousers worn as a formal or business outfit for men or women.

男性が仕事や正式な場で着る、上着とズボンが同じ布地で仕立てられた洋服。dan sei ga shi goto ya sei shiki na ba de ki ru uwa gi to zu bo n ga ona ji nuno ji de shi ta te ra re ta yō fuku

The origin of 背広 (sebiro) is commonly connected with Savile Row, a London street famous for tailoring, but this explanation remains uncertain.

In everyday Japanese, 背広 (sebiro) often suggests a man's work suit, so it appears in scenes about going to the office or attending formal events.