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Mrs Obama, who was photographed wearing outfits she chose herself, says she is aware her wardrobe is under scrutiny. "I'm not going to pretend that I don't care about it. But I also have to be practical," she told Vogue magazine. Annie Leibovitz photographed Mrs Obama wearing a magenta silk dress designed by Jason Wu for the cover portrait. It is the second time she has chosen to wear one of his creations for a high-profile public appearance.
She wore a long white gown by Wu for the inauguration balls on 20 January. Mrs Obama's sense of style has proved influential. On the day she dressed her family in clothes from J Crew for her husband's inauguration, the company's shares leapt 10%. In the accompanying interview for Vogue, Mrs Obama also talks about her role as a social hostess.
"We want entertaining in the White House to feel like America, that we are reminded of all the many facets of our culture. The Latino community, the Asian-American community, the African-American community... hip-hop, spoken word - we want to bring the youth in, for them to hear their voices in this," she said.
On her self-declared role as "mom-in-chief" she will try to take her daughters Malia and Sasha to school every morning, though she acknowledges this may not always be possible. "I like to be a presence in my kids' school. I want to know the teachers; I want to know the parents."
Apart from Bess Truman, Vogue has photographed the wife of every American president since 1929 when President Herbert Hoover's wife, Lou Henry Hoover, was featured