Returns getting frustrating.

I sell clothes for a niche audience. Ccw owners. Demographicly they are big boys. 3xl 4xl and more. It’s been super frustrating because I swear 10/10 are returns citing “too small”. I have the measurements all written out in the pictures and in the bio and wherever else I can put it. Not sure how else I can spell it out for people the sizes and measurements. If I see a 3xl sale I’m expecting a return and that sucks. Amazon makes it waaaay to easy to try stuff and return I swear. And it’s costing me a lot. I’ve tested my product with overweight people. It works fine. It’s just that people are waaay overweight trying to get ccw clothes. Not sure how else to go about without calling out obese people to measure themselves or take sizes 3xl on up off the marketplace saying it’s sold out and to only sell in person or my site. Would you write in the description for bigger people to measure themselves first?