Michelle should be wearing dresses and suits made of fine fabrics, period, on this trip. And no dresses which could be mistaken as a blouse and skirt. Simple cuts and colors, and fer cryin' out loud if she MUST have bare arms, at least do a cap sleeve. If her designers can't be creative and deliver stunning outfits within those easy guidelines, then they have very little leading-edge, unique design savvy.
The same goes for Michelle--she appears to be very limited in style-sense savvy. All she can come up with as a style "trailblazer" are the pumped-up PTA-mom bombs.
And no knits, unless it's a hipper (but still dressy) St. John. L O S E the cardigans, ya bumpkin.