plain gear

例句：

1. 1. The plain clothes made him look more like a worker than a businessman.
   朴素的衣服让他看起来更像是一个工人而不是商人。
2. 2. She wore plain black shoes for the occasion.
   她穿着朴素的黑色鞋子参加这个场合。
3. 3. The plain design of the dress is very popular with women.
   这件衣服朴素的设计非常受女性欢迎。