News flash: Michelle and Barack Obama have landed in London and, contrary to what we had guessed, Michelle changed outfits on the plane. She boarded the plane wearing an ivory custom-made tulle-tweed Thakoon coat. She deplaned wearing Jason Wu's chartreuse silk-crepe short-sleeve sheath dress with a shawl collar. The dress could be a modified version of a look from Wu's fall collection. Or it could be entirely custom. Either way, Wu used the same fabric for a couple of fall pieces. She's cinched the black coat with her signature Alaïa belt. When we know who the coat is by, we'll let you know.
Update: Mrs. O reports the black coat is by Michael Kors.