Of course, there are plenty: Dries Van Noten, Ann Demeulemeester, A.F Vandevorst, Veronique Branquinho, Veronique Leroy, Christian Wijnants, Haider Ackermann, Maison Martin Margiela, Cedric Charlier, Peter Pilotto (is half Belgian), Raf Simons from Dior is Belgian, and now I'm only naming those...