Anyone could wear his suit… as long as he allowed it. Tony is very protective of Iron Man you will be my Valentine shirt, and only four other people* have had a chance to use his suits: Rhodey (Tony’s long-time friend and a skilled Air Force officer); Pepper Potts (the love of his life); Bruce Banner (one of Tony’s closest friends and science partners) and Eric Savin (who stole a suit that had already been altered and repurposed by the Air Force). Beyond this, Tony has denied anyone else access to his Iron Man technology, which is particularly evident in Iron Man 2. Not only does he refuse to allow the US government to take his suits, despite repeated hearings, but he also refuses SHIELD after they make it clear they want Iron Man, but not Tony Stark. He only gets onto the Avengers Initiative by essentially conning his way in.
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Best Iron Man you will be my Valentine shirt
Also, while anyone can (theoretically) wear the Iron Man you will be my Valentine shirt, Tony is just about the only person who can make them. The first two Iron Man films show this, with various foreign powers trying, and failing, to replicate the Iron Man technology (along with Americans like Justin Hammer), and even Obadiah Stane, working with all the resources Stark Industries has to offer, can barely match the suit Tony built “in a cave! With a box of scraps!”President Matthew Ellis also briefly wore a suit in the climax of Iron Man 3, but this was against his will (he had been kidnapped) and he wasn’t able to pilot it.