I have to admit I haven't RTFT but that just means I'm giving my own honest opinion here, not bandwagon jumping:
Normally I do not agree with criticising politicians based on what they wear. I'll occasionally make a favourable comment (I quite like some of Theresa May's clothes and I don't see why she shouldn't be complimented on them, as much as I hated her policies) but I think it is unkind to bitch about the clothes of politicians of either sex. It's not what they're there for.
But this is very much an outfit that someone would only wear to make a statement. It's a "look at me" outfit. It's not something anyone would put on without thinking about the reaction it will get. It's the equivalent of a male politician turning up in shorts and a brightly coloured bow tie.
IF (and it's a big if) this outfit was worn on a work occasion, I can think of two possible statements she could have been making, and neither of them makes me admire her very much:
"Look at me, I'm really interesting and fashionable and likeable, therefore you should listen to what I have to say"
"Look at me, and forget all about the mess my friends and I are making of everyone's future - my clothes are much more memorable!"
If it was a private moment then although the outfit is not my cup of tea I think we ought to butt out.