In Season 5's "Casual Friday", Erin compliments Kelly's outfit, then when Kelly offers to sell Erin her clothes in Season 6, Erin wants to buy it. : r/DunderMifflin
186 Days Of The Office - Day 88 (March 29th) - S5E24: Casual Friday | The Office Amino
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The Office : Casual Friday (2009) - Brent Forrester, Ricky Gervais | Cast and Crew | AllMovie
148 Casual Friday Office Illustrations & Clip Art - iStock