The difference between loose fit and regular is the width/baggyness. The lengths are usually about the same, sometimes a bit longer though too. And yes, there is a pretty big difference. I wear a baggy fit size large in Oakley pants and love them, and then tried the large regular fit and found them almost restrictive in size. Regardless, XXL baggy fit is going to be if you want people to say "that is the most ridiculously baggy gear ever" and XL loose fit will be just pretty big on you.