isaacs-oscar:

I think it was Taika or [producer] Brad Winderbaum, our creative executive. It just goes into the bible of the ‘80s, and what would Tony Stark wear? We make his pants tight, and everything is a little tight because it’s more fitted for Tony Stark, of course. And we made a joke about it. So you know, it worked. 

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Mayes Rubeo [costume designer] about Tony’s clothes in Thor: Ragnarok.