Lance Storm asked this question to WWE years ago and received an answer that is likely still the reason for his peculiar practice. Storm said on Figure Four Daily that WWE wants to present their Superstars in the “most recognizable look” for the fans.
Full ring gear is the image of a Superstar that WWE uses for marketing reasons and to put out on merchandise. So they want to keep a consistent appearance.
It’s hard to believe that WWE thinks fans would see a Superstar in their street clothes backstage and not know who they are, but that seems to be the reason.
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