The Blues' X account posted a picture of the socks in question alongside the message: "London is Blue and so are your socks."
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A dominant first-half display got the job done for the Blues, with a Lauren James goal and Sjoeke Nusken brace causing a serious dent to Arsenal's WSL title hopes. The Gunners are now six points off Emma Hayes' side in top spot with a far-inferior goal difference. Chelsea, meanwhile, are still on course for a near-unprecedented quadruple before their manager departs for the USWNT in the summer.
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That trophy charge resumes for the Blues on Tuesday, when they travel to Ajax in the first leg of their Champions League quarter-final. Arsenal will look to put Friday's result behind them when they take on Aston Villa next Sunday. The pair meet again in the Conti Cup final on March 31.