Ever since Tony Stark first emerged from a desert cave in his Mark I Iron Man suit, fans have been captivated by its potential. If everyone's favorite genius, billionaire, playboy, philanthropist could fashion that suit from a pile of scraps in a cave, the possibilities of what he could create in a lab with proper resources and time seemed boundless. Throughout Iron Man's appearances in the Marvel Cinematic Universe, he has donned many suits. Tony Stark is a relentless tinkerer, never content and always in pursuit of improvements.
Source：https://www.cbr.com/iron-man-strongest-armor-mcu/
