Funny how you would for a second believe that there was some wardrobe malfunction or last minute solution involved in her bizarre cardigan look. It was all well planned to maximise the press coverage and social media chatter.
Also as explained, the theme of the Met Gala was Garden of Time, and she was waxing lyrical about having a wild night in said garden and then just grabbing some old cardigan and running to the Met with her hair still messed up from her fairytale night... Which is ridiculous considering she's also wearing a corset and hardly breathing/moving.
Anyway, any attention is good attention and she would never end up on a red carpet wearing a raggedy old cardigan if it wasn't her intention.