Ultra cool Parisian designer, and one of our faves, Isabel Marant has teamed up with Gap to help in the fight against AIDS. Just in time for World AIDS Day (which falls on December 1st) Marant designed a grey v-neck Gap T-shirt, featuring a laid-back slouchy silhouette and pops of bright colors, to benefit the brand's (PRODUCT) RED effort. Fifty percent of the profits from the sale of the T-shirt —which goes on sale on the 24th — will go to the Global Fund to eliminate AIDS in Africa. So yes, you actually do have a reason to add yet another grey tee to your wardrobe.