What, you think she paid for those dresses? Silly person. If she did, I'd be very surprised.
No, of course not. None of the First Ladies do. I believe they're all "loaners" as otherwise they run into ethics violations. I think the most expensive gift I was allowed to accept as a fed was like $15.
It's the optics of dressing like a billionaire when you're supposed to be relating to the average American. Kinda like Bernie Sanders with a big mouth and multiple mansions.