非不在这里是双重否定。"非“和”不“要分开来看。“让你穿你非不穿”这个短语是一个否定性词语“不穿”和一个反语”非“语气连用而成，目的就是为了强调语气，带有责备的意思，责备不穿外套的这个人不听话，任性，让他做什么可他偏偏不做。

I wanted you to put on the coat. 你不穿 means you refused to . 你非不穿 means you strongly refused to. Here, 非 is used to emphasis on the action of not doing something.

非 = not 不 = not So a double negative becomes positive i.e. to mean "must"

'非'是个语气词 '非不'stubbornly insist not to (wear the clothes)

偏不，就不的意思 英文里是no ,reject it