Well, I don’t like her outfit so I’m not defending it, but your comment sounds like all women should dress in Burka’s or something of the sort.
Just compare that outfit to previous first ladies.
And I’m not referring to natural good looks. Michelle is no beauty, but plenty of first ladies have been more homely than she. It’s her attitude - arrogance and hatefulness - that seeps out through her expression and her chioce of clothing.