Corrected entry: When Stark escapes from his captors wearing the first Iron Man suit, towards the end of the scene he is shot up by a .50 caliber machine gun. Those bullets would have gone straight through the improvised suit, which is only made of those common metals that Stark had access to in the cave and weapons cache, and out the other side.
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Correction: We don't know how the suit is designed. He had access to a great deal of advanced technology, as the reason he was there was to build an advanced weapon. He obviously designed the suit with the intention of repelling the weapons he knew they had.
Stark may have had access to a great deal of access to advanced technology, but the only metals he had were metals that are relatively common on earth. Metals that are relatively common on earth are not strong enough to stop bullets from a 50 caliber machine gun bullets, and there is no way to melt common metals on earth, and mix them to create an alloy strong enough to stop 50 caliber machine gun bullets even with advanced technology.
And there's no way to make an arc reactor either, or create much of the technology we see in the movies. Ultimately some degree of suspension of disbelief is necessary.
Jon Sandys ★