Well I don't know about "the tallest" nor do I want to cunt up a Saga thread with links to other company's products when we're trying to belittle OP for being a sheep here...  But the Theta line of Arc jackets is I believe 6" longer cut?  My Theta Ar goes to my upper-mid thigh and is all super bomber 3L ProShell.  It's still not 3X Saga but it's longer for sure.
Also Norrona makes several longer cut jackets too  I have one of their GoreTex onezies and it's fucking amazing.  Narvik I believe is one of their longer shells, but there are others too.  Bergans is baller and baggy as fuck too.  Top notch materials, but again- you may actually have to wear something that *sort of fits* and I can't tell if that's what we're talking about or not here to be completely honest.
Isn't there also another company called NT3K33somethingorother that custom makes jackets out there?  Maybe look them up.
Also Freeride Systems is all made in USA and I know Mike will make you anything you fucking want if you ask him.
So yeah...  The point I'm trying to make is that people love to bitch and the solution to their problem likely exists- if they spent less time bitching and more time looking they would have found it by now. 

   OP was clearly a n00b who couldn't be bothered to look before he spoke, let's not all follow suit and shoot the messenger for saying "yes, longer goretex or similar jackets exist".  Don't be mad at Sage for not being Bergans.  If you want that, look around for fuck's sake guys.
Saga gonna Saga.  If they stopped doing Saga and became Bergans or Norrona tomorrow you'd all be pissed and you know it.  So...  Cheers?