found a military tailor named Johnstone on Dawson street in Thom's 1894 & 84. This street has a junction with Nassau street.
59 Dawson street - J. B. Johnstone,
military and merchant tailor,
also 34 Sackville street, London
They share the building with 5 solicitors. There is no sign of any Hanrahan tailors, but they would usually not be listed unless they ran their own business. Johnstone tailors is not present at the address in 1914.
Shane