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。

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She came down the stairs slowly, trailing the coat behind her.

她慢慢地走下楼梯，身后拖着大衣。

《柯林斯英汉双解大词典》

The poem represents a kind of as does the short poem, "A Coat" represents a kind of ascetic move, an active imaginative and rhetorical stripping-down.

和短诗一件外套一样,这首诗代表了“,一种禁欲主义，主动的想象和对华丽辞藻的摆脱。

耶鲁公开课 - 现代诗歌课程节选

The morning coat, a pared-down frock coat, though still very fitted, set the trend for smaller coats.

ECONOMIST: Men's clothing

She opened the coat, got back down on her knees, and with one hand yanked the skirt of the coat up behind her, folded over on itself, so that it was out of the way.

NEWYORKER: Brooklyn Circle

Ally took down her coat and suggested they walk along the river.

NEWYORKER: She��s the One