Final answer:
Raf Simons is the Belgian furniture designer who later became a menswear designer and took on the role of creative director for Dior.
Step-by-step explanation:
The Belgian furniture designer who turned menswear designer and became the creative director for Dior is Raf Simons. Raf Simons is known for his minimalist and modern approach to design. Before stepping into the role at Dior, he gained prominence in the fashion industry with his eponymous fashion label, which showcased his unique vision influenced by youth culture and contemporary art. Although the other names listed, such as Hedi Slimane, Kris Van Assche, and Virgil Abloh, are also prominent figures in the fashion industry, it is Raf Simons who fits the description provided in the question.