Blondes by Choice.

Bonnie and Cliff meet cute when she gives him a lift after his car has broken down. Turns out she’s getting ready to open a beauty parlor and bleaches her hair platinum blonde to drum up business much to the chagrin of a local woman’s group. However, when Cliff’s wealthy mother invites Bonnie to be guest of honor at her yacht party things turn around both business and personally for the pair.