WhoawhoawhoawhoaWHOA. Did Tony just step out of his armor in the Spiderman trailer, looking like this beautiful angel, while wearing his own casual equivalent of Loki's all black suit??? IS THAT WHAT I SEE? I NEED ALL THE FANWORKS ABOUT THIS.
He had to rush out to help Peter and accidentally grabbed Loki’s suit instead of his own. This happens regularly so Loki just has his clothes magicked so that if Tony does do this they shrink down to fit him perfectly.