There's got to be a way to bring back Wen Ning's consciousness, Wei Wuxian knows, and if he can't do it himself, then maybe Lan Wangji can help. Unfortunately for Lan Wangji and his suffering heart, he would do nearly anything for Wei Wuxian. Wen Ning did not get a say, because that's the root of the whole problem.
They end up keeping the dress.
If Lan Wangji has learned anything from his atonement for Wei Wuxian’s death, it is that patience is neither simple nor shallow.