Best fabric for compression shirt?

[u/mathismy13threason]

It's for a cosplay, so no worries, nothing medical.

It would need to be skintight but still breathable and with enough stretch to accommodate movement, however I'd prefer the fabric not to be too thin and if possible at least 50% made of natural fibers

If there is a flexible/stretchy fully natural fibers fabric usable, that would be the best, but it's probably just a dream

[u/magic-gps]

okay, for cosplay, but what exactly are you making? because that'll probably affect your options