She seems to be obsessed with belts. She has no fashion sense.
Here is what Time said under a photo
“Mrs. Obama apparently changed into something a little more upbeat for her arrival in London. Here she wears a canary yellow Jason Wu dress under a black Michael Kors coat. The accessory is also familiar: an Azzedine Alaia belt which her husband supposedly calls the “Star Wars belt.””
The black studded belt she keeps wearing: This accessory is also familiar: an Azzedine Alaia belt which her husband supposedly calls the "Star Wars belt."