Nope, especially not the cheap Walmart clothes. Most fabrics are at least 60% polyester

Oh, ok. Walmart doesn't exist in any countries I lived in, so I can't say.

I buy most of my very limited wardrobe at Muji at the moment. But even growing up poor in Germany, it was mostly cotton everywhere as far as I remember.

(Another commentor pointed out apparently female clothing has more polyester.)

I assume you shop in the dude's section. In the dudette's market there is polyester everywhere.

I guess for female clothing I mainly only have exposure to the higher quality stuff, so don't see much polyester?