It can be a challenge! I grew up with the "look for the union label: song in my head... A lot of the textile industries were shut down in the 70s and moved off shore.
Not clothing, but I have switched to "American Made" brand solid quilting fabrics made by Clothworks instead of Kona. So far I've been very happy with the black and white and few colors I've ordered. Here's a video on the product, is both grown and milled in USA --
https://www.missouriquiltco.com/coll...d#lower_footer