Geta, here is a link showing all the patchwork shops in France including loads in Paris.
http://www.cosman.nl/maps/map_fr.php
If you click on the orange buttons individually the shop name, address, and website if any will come up.
Also the French Patchwork Association site is
www.francepatchwork.com
which has a section of retailers advertising, plus a forum you could ask those ladies who live in Paris for help.
Have a good trip!