I agree with the article that wearing loose fitting clothing when you are running can often lead to chafing. I prefer to run in baggy clothing because this is more comfortable for me. Nothing feels worse against my skin than a tight shirt that is soaked with perspiration.
The good news in my case is that the chafing and irritation only happens when I run a really long distance. Normally, I run two or three miles and chafing is not a problem. I also use powder, which helps keep me dry and reduces the chance of chafing.