system
Given the following post, respond as if you're commenting on Reddit:
human
[Iron Man 2] How can Rhodes wear the Mk.II, wouldn't the Arc reactor push against his chest?

Tony originally designed the Mk.II for himself, designed around having an Arc reactor embedded in his chest. When he put the suit on display, he fitted it with an Arc reactor.

Wouldn't this reactor protrude into the chest of the suit? How would someone without a hole in their chest fit into the suit? It didn't look like it had been redesigned to have the chest plate sticking out further to accommodate this.
gpt
When Tony retrofitted the Mk.II for display, the chest piece was redesigned to completely encompass its own arc reactor; there's nothing to press against the user's chest, though there's still tech in the chest ppiece to draw power if the user has their own arc reactor as well. Tony is a master of miniaturization, and even if his suits don't look as such, he's constantly upgrading them. Just look how different the Mk.VII changed after the Battle of New York: it went from being deployed as a mobile package that took several seconds to wrap itself around Tony with the aid of ID bracelets, to a suit that you could simply walk (or jump) straight into.