> “Tailoring is mainly for fit, not looks. … every tailored piece of clothing will always have the best fit and comfort. That's trivial.”

It isn’t trivial; any time a piece of clothing pinches or pulls that is what makes it uncomfortable, and loose clothing doesn’t do that by definition. That means any kind of shaped or fitted clothing including tailoring can only be less-comfortable than loose clothing and approach being equally-comfortable as an upper limit, getting closer with a more skilled tailor.

That means tailoring is mainly for looks - I.e. the only reason tailored clothes exist at all is because wearing a looks bad; start with a super comfortable ‘bag’ and cinch it as close to your body shape as possible so it doesn’t look like a bag, and looks better, get as close as possible without losing that comfort.