The look we should be aiming for minus the Walther PPK.
Now don't forget the shoes and the lacing style. Real Leather. Old nubuck shoes can get new life and look with a tin of quality polish. Kiwi. Don't use those wipe on bottles with the sponge top. Get the flat tins with the wax that has that particular smell you will never forget.
The UK term for this is bulling your shoes (because you are trying to penetrate the leather with the polish which will waterproof and protect it for years from drying out). US term is spit n' shine. Clean the shoes properly first with a shoe brush.
Two hours with a tin of Kiwi polish, 2 cloths and some elbow grease. Use small dabs of polish in firm, circular, nickel sized motions. Occasionally sprinkle some water (or spit) very,very lightly on the area you are working on. Your index finger will be stained for a day or two after that. Buff each layer with a soft cotton cloth when it dries and progressively add another layer on top that. Polish your shoes once a week/fortnight after that with a quick bull and buff.