For those living in Paris, a French blogger has conveniently listed the top Parisian tailors - both bespoke (grande mesure) and made to measure or semi-bespoke (demi-mesure).
His list of tailleurs offering grande mesure includes: Cifonelli, Camps de Luca, Smalto, Gabriel Gonzalez, Rovito and Max Evzeline.
Demi-mesure tailleurs include: Marc Guyot and Elie di Fiore (formerly of Camps de Luca I believe).