Already on the trip, Michelle Obama has sported designs from Isabel Toledo, who created her Inauguration Day dress and jacket; Jason Wu, who designed her one-shoulder white chiffon inaugural ball dress; and a skirt and cardigan from one of her favorites, and a regular in the rotation, J. Crew.
A sparkling cardigan that Mrs. Obama wore early in the day Wednesday -- a $298 item dubbed the Crystal Constellation Cardigan -- quickly sold out, J.Crew told "Good Morning America." The pencil skirt she wore with the sweater is expected to be sold out soon as well, the company said.
"I think she could do no wrong," Vogue's Schulman said. "Frankly, she could wear a rubbish bag and I'd still think she looked great."
But for the first lady, the trip is more than just couture, double-strand pearls and tea and crumpets.
The first lady has her own schedule of events, including a NATO spouses' tour of a "cyber surgery unit" at a local hospital, hosted by Bruni-Sarkozy. On the outing, the French first lady will have the opportunity to showcase technology that allows doctors in France to do minimally invasive surgery by remote-controlled medical robots on patients as far away as Africa.
In the afternoon, the group will visit Cathedral de Notre Dame de Strasbourg.
Prior to the NATO spouses events, Mrs. Obama's trip included a tour of a London health facility on Monday with Sarah Brown, Britain's first lady, and the visit to the all-girls school, where she emphasized the power of an education.
The first lady caused a shrieking frenzy among the 11-17-year-old students at the Elizabeth Garrett Anderson Language School. There she explained why being smart is cool and even shared a little girl talk about her courtship with her husband.
"By getting a good education you too can create your own destiny. I never cut class. I like being smart. I thought being smart was the coolest thing in the world," she said, echoing remarks she has made to students in Washington D.C. "You are the women that will build the world as it should be and that's why a good education is so important."
On Wednesday, she and the president paid a visit to Buckingham Palace to meet with Queen Elizabeth II. The Obamas presented the queen with a gift of an inscribed video iPod, with preloaded songs, and a rare musical songbook signed by U.S. composer Richard Rodgers.
The first lady broke protcol and put her arm around the royal matriach, but the royal no-no was embraced, not only by the queen, but also by her loyal subjects.
Brown says in the eyes of the British, Michelle Obama can do no wrong.
"There was no whiff of disrespect in Michelle's tender and nice gesture that she made where she touched the Queen's shoulder. I think she just would have thought that this is a very authentic and warm woman and she would have responded to the warmth."