C'est Chic was the band's most commercially successful album, reaching number 4 on Billboard's album chart and topping the US R&B chart for eleven weeks. C'est Chic was Billboard's 1979 R&B Album of the Year, claiming the number one spot on Billboard's Year End Review. The album was certified platinum by the RIAA, selling over a million copies. In the UK it peaked at number 2 and has been certified Gold by the BPI.