Skin pH sensors which have been studied so far mainly utilize polymer films as substrates that are suitable for topical wounds. Since polymer films possess limited flexibility, and permeability, the sensors may cause discomfort to the patients with pressure sore who lie on beds for a long time. In this presentation, we propose a textile-based pH sensor with high flexibility fabricated by printing a polymer composite as a working electrode and Ag/AgCl/solid electrolyte as a reference electrode on an textile substrate. The textile working electrode is composed of polyaniline, carbon nanotubes, and agarose printed on the textile. The textile reference electrode is fabricated by printing Ag/AgCl paste and solid electrolyte. We confirmed the performance of the textile pH sensor by measuring the potential difference as a function of the pH of various buffer solutions. The textile pH sensor could be an important step towards flexible skin pH sensors that can be used for medical purposes.