Antoine. His shop is in Accartville North. To get there, get a taxi to go just past the bar "Jardin D'Eden" in that neighborhood and drop you off at the road just after Jardin D'Eden you will see a mini bar called CP1. Walk approximately 2 blocks in on that CP1 road, and on the left hand side - you will see a mango tree surrounded by lots and lots of mud bricks. The door to the tailor is right by that tree - ask someone sitting in the street if you can't find him.
