Ok, i haven't read this whole thread, but as a real parisian (20+ years in the city) here is the deal. Parisian fashion is definitely on the elegant conservative side as compared to lets say london or scandinavian capitols. There isn't too much emphasis on bright colors, it's rather black / white, beige, military green, indigo blue for jeans, you know neutral colors. Obviously the cut is very important, women and guys like it slim, skinny actually. You want to know how girls get so skinny here? well a recent article presented 80% of girls in their twenties had eating disorders (ie anorexia) !!
Jackets and shoes is where most of the budget will go. Accessories is where your personality will shine, scarves, pins, bags... Handbags must be unique, any logo / monogram bag is an ABSOLUTE no and will trigger the tourist alarm. Hair, well several options here, but i'd say the fringe (la frange) is still probably what would define la parisienne. Generally the first impression is very subtle, but in reality hours are spent to insure every little thing falls in the right place..
These are just general pointers, but any real parisian will be able to tell from what neighbourhood (quartier) you are, from your look. So there really isn't just one parisian look obviously. The main areas would be:
- the marais. in the dead center, originally the gay hood. it's crawling with young fashion / interior designers. the most outspoken parisian style.
- the east side (bastille / oberkampf). very left wing / punk / goth. but now becoming trendy again around the canal st. martin, so kind of grunge chic.
- rive gauche (saint germain). the intellectual, university area. this is where the "parisienne" look all started. style could be described as parisian modern classic. labels to look out for: Vanessa Bruno, Isabel Marant, Zadig & Voltaire... and check out Bon Marche, paris's most elegant department store.
- the west side (champs elysee). besides the tourists, it's mostly business people and the wealthy that reside here. Also the elitist night spots such as Buddha Bar, VIP, L'etoile... think LV / Armani by day, Dior / Prada by night..