ISO 100% cotton sweatshirts that actually mean it

I'm having such a difficult time finding sweatshirts (crewnecks, hoodies, etc) that aren't a cotton/poly blend. I found out ALL of mine are. I also am discovering polyester makes me itch like crazy and I'm trying to get it all out of my closet so I feel more comfortable (keyword trying, my bank account can't even handle all the thrifting). Anyone have any brands they recommend??