Well .... google you it you said ....
Its roots come from 1977, when former Marquette men's basketball coach Al McGuire was asked if he'd be wearing a lucky blazer while coaching in that year's NCAA Tournament. He replied with a resounding “absolutely,” then quipped, “You gotta wear the blue blazer when you go to the big dance.”
Good to know! Thanks for doing the legwork for me!
Hehe I love knowing about sayings, so it was a given I would do it.