PET fabric is coated with conducting polypyrrole (PPy) by oxidative polymerization from an aqueous solution of Py using ferric chloride hexahydrate ($FeCl_3$) as oxidant and p-toluene sulphonate (pTSA) as dopant. The optimum concentrations for Py, $FeCl_3$ and pTSA were found to be 0.11, 0.857 and 0.077 mol/l respectively, which yielded a conductive fabrics with resistivity as low as 72 ${Omega}/sq$. PPy fabric gained resistivity less than one order of magnitude when aged for 18 months at room temperature. The stabilizing effect of the dopant pTSA against thermal degradation was demonstrated; the undoped samples reached resistivity of around 40 $k{Omega}$, whereas doped samples reached less than 2 $k{Omega}$ at the same temperature and time.