You can let a coat down by using the hem.

你可以把褶边放出来，以加长这件上衣。

youdao

You can let a coat down (lengthen it) by using the hem.

你可以利用下摆把一件外衣放长。

youdao

The men that breed from them they traffic up and down, but cling to their cities' hem as a child to the mother's gown.

城市孕育的这些人，他们熙熙攘攘地穿梭，却只能依附于各自城市的边缘，犹如孩子偎依在母亲的长袍上一样。

youdao

But I do realise that most of what we happily wolf down over here isn't fit to touch the hem of the humblest shophouse in the Thai capital.

BBC: Postcard from Bangkok

And then with the team away, the carriage rolling down the gravel path, Mattie turned, lifting the hem of her robe, and mounted the steps only to see that horrible child Pearl, insolent as ever, standing, arms folded, against the pillar as if the plantation was her own.

NPR: E.L. Doctorow on Sherman and 'The March'