What I wore in the 70's:
Blackbottom wool shorts (made in Salt Lake then), a t-shirt if it was a training ride, else a woolie jersey, little teeny white socks (USCF said!), kangaroo leather shoes with real wooden soles, crochet-back gloves, and a leather hairnet if it was a criterium, for all else a proper cycling cap with the brim turned up. Talk about organic! Wearing dead animal parts is about as organic as one can get...and I still have a lot of that crap, too.
Oooh, and a little cycle computer that went tictictictic until you were completely crazy.
The bar part of that ride sounds like fun...