She’s not going to wear that dress again. Fashion designers lend their work out for publicity at events.
IIRC, that was a Hollywood function several years ago, not a political event. She now is more demure, as is appropriate for her status as a potential First Lady.
I’m glad she won’t. It’s not the type of dress that does much for anyone. Has it’s own wierd look somehow. She can do better...she is lovely.