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1·The suit’s W-collar seems to have developed from turning down the stand-up collar of a frock coat, which in turn derived from army and naval wear.

把礼服大衣竖着的领子翻下来就形成了W型的领口，反过来礼服大衣又来源于陆军和海军的军装。

2·Turn a collar down; a collar that turns down.

翻下衣领；能翻下的衣领。

3·It is so hot inside. Please turn down your coat collar.

里面太热了，请把大衣领翻下。

4·You should turn down your coat collar.

你应将衣领翻开。