According to Jim · S04E17
The Mustache
2005-03-08 · 23 min · 4.3 (2) · TMDB
A hot delivery girl gives Jim some fashion advice, prompting him to grow a mustache, which Cheryl hates. Cheryl retaliates by becoming a brunette - but Jim loves it. After a chance meeting with the girl, Cheryl asks her to give Jim suggestions that will make him look ridiculous.