Well I started a thread saying I loved her look, so am as guilty as anyone of remarking on her clothes.
But I think clothes do matter, just like rhetoric, bearing and personal hygiene matter for a politician or leader. And also I thing we do care about, notice and comment on what men wear. Boris and Corbyn have both been torn to shreds over their style choices. Barack Obama and David Miliband have been praised for their exquisite style.
If Trump had turned up in his beach shorts and a string vest, no one would have failed to remark on it because he's a man and only his politics matter. What bollocks.
There is a sexist issue in relation to clothes, and it's the cultural expectation that men will always wear a sober suit for formal occasions, while women will dress up in something more interesting. I would prefer it if men weren't so restricted by expectations and could glam it up in any colour and more interesting styles as well. Everything should be open to all. And there are some men who do embrace that, Grayson Perry and Eddie Izzard will do dresses, while others do stick to the more traditionally male wardrobe but add a lot of detail and style.
I will happily discuss anyone's style, male or female, but Theresa May is a well-known fashion lover and often has really interesting outfits to discuss.
What I think is really sexist is that caring about clothes is seen as something trivial and female. That's actually a total illusion. Try to get a man into something he doesn't want to wear - men really do care about clothes and express themselves through clothes, it's just that they're traditionally expected and raised to be to be more conservative and restrained.
To be clothes and fashion are an aspect of design, and matter in the same way as other design does – architecture, interior design, font design, city planning. They make a big difference to our lives and do affect things.
Boris is a classic example of how a particular look (unkempt and clownish in his case) contributes to how you are seen and how seriously you are taken. It is far from being a thing that only relates to women.