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Fabric supercapacitors are disclosed herein. The fabric supercapacitor can include an ion permeable separator layer having two opposed surfaces; two electrode layers disposed on the opposed surfaces of the ion permeable separator layer; and two conducting layers disposed on outer surfaces of the two electrode layers and opposite the ion permeable separator layer. The electrode layers can comprise an activated carbon fiber fabric. The activated carbon fiber fabric can be derived from a precursor fabric which has been carbonized, activated, and coated with an electrolyte. The electrolyte can include a polymer gel. The conducting layers can include a non-activated carbon fiber fabric. The fabric supercapacitors disclosed herein exhibit great flexibility which allows the supercapacitors to find use in applications such as apparel products, outdoor activity products, sports wears, and other industrial end uses. Methods of making fabric supercapacitors are also disclosed.