1. travel smith or equivalent blue silk blazer with 6 zipper pockets.
2. dockers wool/plastic pants, with the zipper pockets below the standard pockets.
4. trenchcoat with liner(in winter).
5. widest brim fedora(3+") i can find.
6. around the neck/under the arm pocket carriers.
pack
3. 3 pairs lightweight shoes in dark color that will dry overnight.

although many "do not care what eurpoeans care" they don't, and they match that lack of care with abusive service. as an extreme, you show in your favorite tennies and ratty jeans at the door of the Ritz in Paris, you will be stopped by the doorman(i was).