普通西装

例句：

1. 1. He always wears a plain shirt and ordinary trousers when going to the office.
   他上班时总是穿着一件普通的衬衫和裤子。
2. 2. She decided to buy a new pair of dress shoes for her special occasion.
   她决定买一双新裙子鞋，为她的特别场合。
3. 3. The businessman wore a formal suit to the meeting.
   那位商人穿着正式的西装出席了会议。