It feels like a perfect night to dress up like hipsters
Here Taylor is saying how tonight is the perfect night to pretend to be someone else — reality is too hard to face, so they will party to take away the stress. Also, since Taylor is so famous she must hide her appearance in order to go into public without getting mobbed.
The reason Taylor said they should dress up like hipsters is that hipsters do things before it becomes popular — Taylor is tired of the same old things and being confined in a box.
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