a piece of clothing that covers the lower part of the body from the waist to the feet, consisting of two cylinder-shaped parts, one for each leg, that are joined at the top

I need a new pair of trousers to go with this jacket. 我需要一条新裤子来配这件夹克。

Why aren't you wearing any trousers, David? 戴维德，你为什么不穿长裤呢？