Thanks to all of you for your suggestions and comments!
We spend a lot of time in France, and take pretty much this same trip each September, so I'm pretty used to what to expect weather-wise.
In the past I've sometimes taken a trench and haven't worn it, but I may take my Eileen Fisher anorak jacket since that works better for our casual lifestyle in Provence, where we do a fair amount of hiking and bicycling, but doesn't look too scruffy for daytime in Paris.
Harmonica, I don't think I can bear to leave my black pants at home, but we'll see how stuffed my suitcase is!
Jeanne, you're welcome to stow away!
Suz, I followed your travel capsule with great interest, and I hope I can manage to do as well as you did in preparing for all my different requirements.
I agree that comfortable shoes for walking are essential. It's always so hard, because I want to take my cutest things, but on vacation if your feet hurt you really can't enjoy yourself.
Pat C., yes September is a great time to go- much less crowded since French people's vacations are over. I love Nice, too! We stay up near Arles and les Baux, in olive and wine country.
Zap, i'm not taking all those shoes. I'll be (painfully) paring it down to just a few pairs.
Elle, Weight isn't really an issue, but I'm just trying to not go TOO crazy. I can always wear my jeans on the plane- they're very comfortable.
Bj1111, umbrella, check!
Lantana, it sounds like you've got packing light down to a science!
lf we were just going to Paris I would leave the white pants at home, but I'll like having them in the south, and we do have a washer and dryer in our house there.
You've got some great tips! I can't promise to keep it quite so minimal, but I'm trying to be reasonably sensible...
Beth Ann, well the zoo is fun, too!
JR, Joy, thanks!
Carole, definitely a couple of scarves, to try to look très Parisienne!
If you all aren't sick of this, I'll post some revisions later, along with some shoe decisions. Thanks, all!