An endoprosthesis for repair of aneurysm in an artery that has an arterial bifurcation for blood to flow downstream from the artery to the bifurcation, the endoprosthesis comprising: a main body configured to be placed in an artery upstream of the arterial bifurcation, the main body having a distal end with an anchor portion and a fabric portion of the main body, the distal end with an anchor portion being connected to the fabric portion of the main body, the fabric portion having inner and outer surfaces, the fabric portion being connected to a first plurality of spaced apart stent hoops (122, 124, 126), the endoprosthesis further comprising two tubular flow passages or legs, the main body extending from the distal end along a longitudinal axis into the two tubular flow passages or legs (106, 108) each of the legs including respective second and third plurality of spaced apart stent hoops connected to the fabric portion of each leg; a first tubular extension configured for insertion into one of the two legs; a second tubular extension configured for insertion into the other of the two legs, each of the first and second tubular extensions having an outer surface and an inner surface; and a first suture (152, 154) disposed along on the outer surface of the main body, the at least a first suture connecting at least two of the spaced apart stent hoops on the main body together, the at least a first suture including unidirectional barbs configured to reduce movement of the main body with respect to the artery in the direction of blood flow; the endoprosthesis further comprising at least another suture disposed about the circumference of the outer surface of the fabric portion proximate a junction between the anchor portion and the fabric portion of the main body, the at least another suture comprising a section having barbs oriented in a first direction and another section having barbs oriented in a second direction generally opposite the first direction. a main body configured to be placed in an artery upstream of the arterial bifurcation, the main body having a distal end with an anchor portion and a fabric portion of the main body, the distal end with an anchor portion being connected to the fabric portion of the main body, the fabric portion having inner and outer surfaces, the fabric portion being connected to a first plurality of spaced apart stent hoops (122, 124, 126), the endoprosthesis further comprising two tubular flow passages or legs, the main body extending from the distal end along a longitudinal axis into the two tubular flow passages or legs (106, 108) each of the legs including respective second and third plurality of spaced apart stent hoops connected to the fabric portion of each leg; a first tubular extension configured for insertion into one of the two legs; a second tubular extension configured for insertion into the other of the two legs, each of the first and second tubular extensions having an outer surface and an inner surface; and a first suture (152, 154) disposed along on the outer surface of the main body, the at least a first suture connecting at least two of the spaced apart stent hoops on the main body together, the at least a first suture including unidirectional barbs configured to reduce movement of the main body with respect to the artery in the direction of blood flow; the endoprosthesis further comprising at least another suture disposed about the circumference of the outer surface of the fabric portion proximate a junction between the anchor portion and the fabric portion of the main body, the at least another suture comprising a section having barbs oriented in a first direction and another section having barbs oriented in a second direction generally opposite the first direction.