Invincible Iron Man (2005 series) #5

Tony's external armour is the new lighter flexible version he'd been working on, that could once again be carried in a briefcase. As mentioned last issue, it didn't yet work because he couldn't get the control systems to fit in it, or the body-fitting undersuit. But now Extremis has the control systems in his brain, and the undersuit stored in his bones, and he can call the other components to fit round him. Outwardly the new suit looks the same as the previous armour. The new origin makes the creation of the original Iron Man a bit more believable. Stark had met Yinsen at a conference before. Yinsen had been working on magnetic removal of shrapnel, which was how he was able to devise the system which kept the metal shard from penetrating deeper into Tony's heart. And Stark had already been working on an exo-skeleton for military use.