Tony Stark donned the Silver Centurion armor in Iron Man #200 ostensibly to upgrade before reclaiming Stark Enterprises from Obadiah Stane, the Iron Monger. I think he was just making room for his luxuriant comeback mullet:
"Wouldn't want to cage in a magnificent pelt like that, would we?" spits hateful old gray n' baldy. Here's another view of Stark's flowing raven locks:
He went around looking like this for quite a while, but I can't see Robert Downey Jr going along with a mullet. God, I hope not.