Setting up the wardrobe
Our big green, angry friend, Dr. Banner is known through the comics, cartoons, and movies as sporting a rather fetching pair of purple shorts at all times. How they stretch as he turns into the Hulk instead of shredding like the rest of his clothing is one of Marvel’s little mysteries.
In The Incredible Hulk 2008 version, Betty Ross goes out to buy some clothes for Bruce, to keep his dignity intact, and he comes out of the bathroom holding a pair of purple shorts with a stretchy waistband, wearing an incredulous look on his face. He obviously doesn’t realize that these are going to be his new favorite outfit.