Or maybe she supports a poor village devastated by nature or disease by buying some items from them.
Our church supported a poor village in the poorest area in India one time where women wove their own hand-made cotton bags. We bought and sold at a loss, but it didn't matter. They earned money from our purchases. I carried my college books in one of those bags. It beat getting my books dirty.
good point. But. She can buy them to support, but she should not wear them...
I know first ladies who've supported fashion designers who lived the high life instead of helping other people.
I think a person like Michele Obama, whose good works are seldom published probably has to wear some designer clothes to keep the industry okay, but I bet she also picks some clothes for their comfort and that of a poor village somewhere here or abroad. Her religion may also make her keep her good works and deeds a secret.
I don't think she is religious at all. But I don't know.
I hope she keeps supporting poor people and never forgets them. They don't have access to fancy top-of-the-line fabrics and have to make things from fabrics they make themselves, and they may not own an iron.
silk dupioni IS fancy top-of the fabrics 
To her credit, Mrs. Obama may not have tried to "fix the little people's lack of an iron" with all her money and resources in order to honor their honest labor and failure to have the best equipment because they're so poor.
well, here I have to disagree. One can iron a silk skirt in 5 minutes - just need a board an iron and a desire to do it and an iron even does not have to be electric. People were starching and ironing clothes ages ago. On all continents and on all economic levels.
You don't have to be rich to iron a skirt.
Slaves in the South when they were attending church or wedding or other event - were all dressed and pressed.
Gosh, I have the impression that actually the ironing is mostly left in the black community - the ladies nicely dressed and going to church on Sundays are always in ironed clothes. And men too.
We do not know, but there's a reason wise people do as they do.