Because each employee's body size is not the same, then it is required in the waist of trousers design above should be different.

因为公司的每个员工身材体型都是不一样的，那么就要求在裤子的腰围设计上面要有所不同。

youdao

She tucked her thumbs into the waist of her trousers.

她把拇指插进裤腰里。

《柯林斯英汉双解大词典》

The waist of the trousers is too loose.; The trousers are too wide in the waist.

裤腰太肥了。

《新英汉大辞典》

Her one pair of trousers, black, with a slightly high waist, were the perfect antidote to the super-skinny or super-slouchy pants you find everywhere: a great-fitting, straightforward pant.

FORBES: Gen Art Showcases Future Stars Of New York Fashion Week

Many of them sport lungis, a sarong-like cloth wrapped around the waist, instead of kurta-pyjamas, a collarless knee-length shirt worn with loose-fitting trousers.

CNN: Center Cut