I, too, love Paris! I have only been once - for my honeymoon! We spent about 4 days in June and barely slept for all the wonderful sights to see! I did not go to any fabric shops but did visit many museums, cathedrals, statues, parks, monuments, cafe's, etc etc etc.
In June the flowers are at their peak at Les Tuileries, so take your time walking there and snap lots of inspirational pictures! Sunset on the Seine, walking the artists conclave in Montmartre, taking in all the amazing famous art at the Louvre, gazing at the massive Eiffel Tower from across the street at the Trocadaro, standing in quiet prayer at Notre Dame Cathedral and Sacre Coeur Basilica, eating an outdoor lunch of fresh baquettes from the local Patisserie with fresh cheese from the local Fromagerie, relaxing after a long day at a sidewalk cafe with a nice cup of your favorite drink. Oh the memories!!
I hope you can squeeze in a visit to a fabric shop while there. Four days is barely enough for a visit to Paris -- and will leave you begging for more!!