As far as I know this is a Pinkspacedog original. It is not a new one, but I just realized that he never got posted. Remember back in the 90's Amazing Spider-man cartoon? Or was the 90's X-men cartoon? Well anyway, Spider-man worked with the x-men for a few episodes. I remember something about Professor X making Spidey an honorary X-Man. This is my idea of the possible costume Spidey would have worn if he had joined the (Jim Lee) X-men full-time.
The leg packs were the belt from a wolverine icon. The chest X is also the belt buckle from the wolverine icon. The big spider on the back still needs to be painted blue.