Darth Vader's suit was fitted to Anakin Skywalker shortly after his recovery from the planet Mustafar. According to this article, his armor comprised of a number of rare components, including a Mandalorian Crush Gaunt, a glove capable of deflecting a lightsaber, and sith amulet and sith alchemy to top it off.
Considering the rarity and uniqueness of these components and the effort that was likely required, was Darth Vader's suit designed and assembled before or after Anakin's duel on Mustafar? If it were assembled prior to the duel, then what were Chancellor Palpatine's plans for such a unique set of armor? Does it suggest that Palpatine foresaw Anakins defeat at the hands of Obi-Wan?