Pink Ladies (from Joe's?)

Walking downtown on Market Street these three gents left Joe's Pizza and headed for their car(s). A vivid sight--the pink socks can't be accidental!  I have no idea what the shirts signify here (I didn't stop to inquire at Joe's, but a google search tells me that the Pink Ladies were a clique of high school girls in the two Grease movies of 1978 and 1982).  Several blips in the past have included Joe's--here's a view with context.