No, in high-end fashion they have just moved the function from any practical function entirely to aesthetic function.

In other words, its form?

The function of the garment is just to appear. It has no practical function.

It needs to stay intact, cover the parts of the body it intends to, move in a certain way, etc. so it does have some practical functionality.

What I mean by "look good", is the same as anyone means by "look good", that is the object appeals to the user's subjective aesthetic senses.

I mean specifically. I am not looking for a definition of what looking good means hahaha

Looking good means different things to different people.

It does, but I am talking about in the context of contemporary high-end women's fashion today.

you can make stuff that is baggy and beautiful.

You can, but baggy is not currently considered beautiful in the context of contemporary high-end women's fashion. The current fashion is for form-fitting clothes that flatter women's bodies.

I mean you have companies like Pivotte who make women's slack with functional pockets.

Pivotte is not designer fashion, hun. If you don't mind looking like a soccer mom, of course you can find trousers with giant pockets.