It's ridiculous. When did Spiderman become the Hulk?
Spiderman costumes should just basically be underoos/long johns. Hell, ALL superhero costumes should just be underoos/long johns.
Fake muscles in Halloween costumes are the modern day equivalent of having a picture of the character you're supposed to be dressed up as on your chest. I always HAAAATTED those costumes as a child. It's like, "LOOK, I want to dress up as DARTH VADER, not have a PICTURE of him on a plastic bib!"
Why are adults so stupid when it comes to designing kid stuff?