Melania has recentlyish worn two black-and-white outfits, both very different.
First up, the “competent” outfit (seriously, this exact outfit is what you get when you search “competent woman).
Gets the job done, is classic, the end. Not especially stylish or Melania-like (except for that subtle white stitching detail), but it works for this venue. She’s doing a job that’s focused on conversation, not on herself.
Nest up, the “fashion” outfit. The cropped, wide-leg pants (which you can’t see because I refuse to embed the images that Getty has which have her from a slightly below angle which makes her look awful) are very now, and the double-breasted yet tailored jacket is quite a striking look.
She’s also doing her job here, but in this case the entire point of the job is a photo-op — to look at her.