London: US first lady Michelle Obama believes her fashion choices are "very practical".

"I have to wear what I love. I have to feel good in it. My day-to-day wardrobe choices are very practical. I'm like, 'What's the temperature? Am I going to be sitting in the grass? Will I be playing with kids? Can I sit on the floor?' website quoted the 47-year-old as saying.

Michelle also reveals she likes to think little about her clothes once she has them on.

"If I'm comfortable in what I have on, that's second nature, and then all my attention can go on the people in the room that I'm with at the time, and I don't have to worry whether something is riding up or whether my feet hurt. I don't want to waste anxiety on something as limited as clothes," she added.