Replying to Oakley vs. other companies

im looking at getting an oakley coat its a xxl loos fit and iv been making sure its big enough. iv been checking sagas and other sizing charts to see if its the biggest and it was until i saw sessions sizing chart which said its stuff is much bigger like 10 inches. the thing is i have a sessions jacket now in xl and im looking for a much longer coat so im wondering if anyone else has found the sessions sizing chart off and that if the oakley xxl is the longest i can get. thanks