Because it's very difficult to find comfortable clothing for fat people these days. Plus I don't like wearing plastic clothes. Everything is an athletic fit and ends up skin tight around the lower half of the shirt for example. Tough to find pants these days too. Every pair of jeans I liked through the years moved out of US manufacturing and changed the fit. I don't need clothing for fashion while I am standing around drinking a Latte. I need clothing that I'm not showing too much from behind when bent over and twisted around trying to get the bolt loose in an industrial dryer, or a shirt that my stomach isn't hanging below because I have to reach up there.