1870 18 June 388/2 This belt pocket, which is intended to hold money and small articles, is made of brown enameled cloth.
1908 43 245 It would seem advisable for regimental commanders to prescribe which belt-pockets shall be for the reserve or ‘emergency’ ammunition.
2015 (Nexis) 9 Dec. A headset cable connected to my phone in a belt pocket.