Let’s taper in the sides, slim up those legs and arms, make the whole outfit a bit more streamlined.
. We mean, he’s been clunking about in the same cumbersome suit for what, four decades now? You can still feel free to force-choke any who insult the power of the Force, and you can still wreak havoc on the weak rebel scum who try to stop you from personally invading their Starships..And don’t worry, you can still be as fearsome and terrifying to any and all who cross your path, because you will still be covered in black from head to toe, and you’ll still have the iconic Vader helmet.