I think a lot of people here are being disingenuous and arguing for argument's sake.
It was a very special moment. You can't ignore that.
Away from MN people interested in fashion will be talking about this.
They did the same thing 40 years ago, for men and women. Michael Foot in his donkey jacket, if anyone here is old enough to know that, Norma Major in a home made suit, Cherie Blair, etc.
They are in a high profile public role. Clothes matter and it's naiive to think otherwise.