By the end of the 1940s, superheroes had lost a lot of their appeal to the public. National Comics (now DC Comics) went from having dozens of superhero titles to only having a handful. Most of the members of the Justice Society of America fell out of sight in the world of National. Flash and Green Lantern went from appearing in multiple titles to not appearing in any books at all!
Mike Zeck came up with the actual look and it is a stunning piece of design. All black except for the prominent white spider. Rick Leonardi also did some tweaks to the costume and it soon became the most controversial, yet surprisingly popular costume change in comic book history. Fans were aghast at first but then really started to enjoy the new look. Eventually, the design was adapted for the villain Venom, with Spider-Man returning to his classic look. It is popular enough, though, that it still makes occasional comebacks.