jack,即Jack,-et,小词后缀。即小Jack,用于指这种衣服。另一种说法是来自古法语Jacque,人名Jack的法语形式，在古法语时为农民常用名，代指法国农民，即农民伯伯的衣服。

1. Will you lend me your jacket for a little while?

你能把上衣借给我穿一会儿吗？

2. He took his flashlight from his jacket pocket and switched it on.

他从夹克口袋里拿出手电筒，打开开关。

3. With her was a youngish man in a dinner jacket.

和她在一起的是一个略显年轻、身着无尾礼服的男人。

4. The middle button of his uniform jacket was strained over his belly.

制服上装中间的纽扣在他的肚子上绷得紧紧的。

5. He never washed, and always wore a filthy old jacket.

他总是穿着一件从来不洗的脏兮兮的旧夹克。