According to Jim (2001)
S4E17 The Mustache
Episode Overview
When a stylish delivery girl offers Jim some trendy tips, he decides to sport a mustache, much to Cheryl’s dismay. In response, Cheryl dyes her hair brown, a change that Jim finds appealing. After an unexpected encounter with the delivery girl, Cheryl enlists her help to suggest fashion choices that would make Jim appear absurdly over-the-top.
HD
S4