Since who the press is now calling "M-Bam" likes merchandise that can be picked up at a shopping mall or ordered online, she just needs to step up from Old Navy and J. Crew. All of these styles are from Ann Taylor and Talbots (with the exception of the first one, from Calvin Klein). The Ann Taylor site even lets you buy the skirt and the jacket separately, so you can deal with figure problems like a bigger bottom than top.
All of these women look lovely, pulled-together, competent, NOT VAIN, yet stylish. All the FOTUS would need is a distinctive pin and bracelet, or earrings and bracelet watch (2 but not 4 jewelry items: MAXIMUM 3), possibly a bright silk tank or scarf, and some decently-fitted shoes. And stockings. And well-chosen supportive undergarments. And a tailor to make sure the garments are properly fitted. Welcome to the big leagues, Michelle. People who make it look effortless are the ones who put in the most effort, it turns out.