I so disagree.
I've been to Paris 15+ times, and never felt like a tourist, nor was treated like one. (Good college French helps.)
Essentials:
-Good-looking trench coat. (Mine is black Michael Kors, with gold buttons. Detachable wool liner. Detachable hood.)
-Black leggings that look like skinny pants (Hue.)
-Jeggings that look like skinny jeans (Hue.) So much lighter than actual jeans, plus elastic in the waist is wonderful for fine dining!
-Basic black knit pants (NYDJ)
-Attractive black yoga pants (Zella) and jacket (i.e., don't look like athletic wear.)
-2-3 long comfortable cotton knit tunics. (JoyJoy)
2-3 non-wrinkle blouses.
Long black silk/cashmere cardigan
Lightweight jean jacket
Black cotton-knit flowy skirt in case of unseasonably hot weather. (Ella Moss)
Striped "Marinieres" (French fisherman's tee shirts) and belt to go with skirt.
(Short jean skirt and sleeveless T's if going south to Provence.)
Scarves, scarves, scarves:
3-4 French silk designer (Hermes, etc.)
2-3 warmer (Tory Burch wool blend, etc.)
Most important of ALL: shoes, shoes, shoes!!
(I have bad feet, so I take more than I would like to in traveling carry-on only.)
-World's most comfortable black boots or booties, weather-proofed, with Dr. Scholl's insoles. (Wear on plane.)
-Black Reef flipflops (bedroom slippers/shower shoes/ hot weather staple.)
-Black Nike Free sneakers
-Black Tory Burch Reva flats
-Fashion-forward patten-leather oxfords with athletic soles. (Bought last time I was in Paris. Now they are everywhere here.)
-or Mephistos.
Last of all, lots of fun COSTUME jewelry!
With scarves and jewelry, you can stretch 3 outfits into 30.
The main thing is to BE COMFORTABLE, FEEL GOOD ABOUT YOURSELF, AND HAVE THE TIME OF YOUR LIFE!
(And stay CLASSY!)