Definition of "baggies"

If everybody had an ocean across the U.S.A. / Then everybody'd be surfin' like Californi-a / You'd seem 'em wearin' their baggies, Huarachi sandals too

1963, Brian Wilson (lyrics and music), “Surfin' U.S.A.”, performed by Beach Boys

But if you are going to say hello or wave to other riders, don't make distinctions based on whether they are riding fat tyres or thin, wear their socks above or below their knee warmers, or wear Lycra or baggies.

2021, Hannah Reynolds, 1001 Cycling Tips: The essential cyclists' guide