Semi natural fiber leggings that wont bag/stretch if worn multiple times?

Hi all! I'm looking for what feels like the holy grail of leggings, at least somewhat sustainable, breathable, and can be worn 2-3x without bagging/losing shape. I'm going on a trip with limited access to laundry, so keeping shape for multiple wears really is the main concern (along with not being transparent, I had this issue with the pact leggings I tried).