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[MCU] Who is Thor's stylist when he uses Mjolnir to 'suit up'? And related questions.

*ENDGAME SPOILERS!*

In the first 'Thor', upon earning back Mjolnir, Thor holds the mighty hammer aloft and as his powers are restored so too is his costume from earlier in the film.  Okay, that's simple enough.

I forget in what capacity we see this in other films until 'Endgame' - if I recall he's pretty much just in whatever costume already whenever he needs it.

But then in 'Endgame' he's been without Mjolnir for quite some time, he has grown fat and disheveled and has presumably not 'suited up' in a long time.  However, towards the end when he, once again, holds up Mjolnir, he is suited up in a costume that is more befitting his new size and grooming habits, most obviously with a braided beard.

So my question is: who or what is doing this?  What unseen Norse god of style is "making it work", so-to-speak?  Obviously he's not just squeezing into an older costume or else it wouldn't fit, and the braided beard thing is a look we'd never seen before.  Surely some intelligent force is deciding this, but who?

At that - could *anyone* wielding Mjolnir get the same glow-up from whatever divine fashionista if they so desire (I assume the costume only appears when desired, since Thor uses it other times without gaining it)?  Could Captain America have gotten a really cool viking makeover had more pressing matters not been at the forefront of his mind?
gpt
Thor did it to himself.  Mjolnir makes your exterior match your interior idealized self - working with what it's got, of course.  It couldn't make you thinner or have longer hair, it just grooms what you have.

Steve's hair is too short for much of a makeover, but maybe it could be slicked back or something if he thought that was the way he should look.