So said Beverly Sutphin – actress Kathleen Turner – in John Waters’ 1994 comedy/satire “Serial Mom”.

The lady perpetrating the fashion faux-pas is played by Patty Hearst.  (If you don’t know who Patty Hearst is and what happened in 1974 – just do an internet search for “Patty Hearst SLA” and you’ll get the gist.)

For more info about Serial Mom on rottentomatoes.com

The unofficial fashion rule can be traced back more than 100 years to some snobby millionaires.

These days anyone can wear white anytime.     

mentalfloss.com: Why Can’t You Wear White After Labor Day? | Mental Floss