Being in Paris I rarely had any time to shop, quelle horror!
However luckily where I work there are a few boutiques within running distance and so a couple of lunchtimes provided a rare break for freedom.
My newest favourite is French shop Les Petites
"Day time" couture to stay feminine in all circumstances
French chic at high end highstreet prices - think 100 - 150euros for a skirt or jumper, 200-300euros for a coat
They do have shops in London - Sloane Street and Westbourne Grove