The prostheses include an endovascular member in need of repair and a patch therefore, as well as prostheses including two or more endovascular members, such as stent-grafts, which may be assembled in situ. Components of the prostheses are held together in substantially fluid tight engagement as the result of hook and loop structures which are present on the members. The hooks engage the loops to secure the components to one another. As a result, the present invention is particularly useful for the in situ repair of damaged prostheses and for the in situ assembly of bifurcated endovascular prostheses, particularly for the treatment of abdominal aortic aneurysms.