I have not spent much time in France, however, I recommend taking skirts. They are light, little, and flexible. You can dress them up or dress them down. As long as they are not Ally McBeal short, you should be comfortable walking around the city all day and/or giving tours. Tencel and matte jersey fabrics wash and travel well. Also some of the new dark denim skirts would work well. Yeah-they are jeans but they can be dressed up to business casual very easily. Take a few scarfs and plain white t-shirts. You'll be all set! You'll have all the American tourists jeolous of you as you give tours ;-P

Erina in Amsterdam, The Netherlands http://www.time-travellers.org/Historian