If you cannot find the official version free, these near-identical geometric sans-serifs are legally free for both personal and commercial use:
: It acts as a typographic mirror of Mr. Saint Laurent—timeless, sophisticated, and universal. Singulier Regular Font Free Download
drew inspiration from the early 1960s, specifically the geometric monogram and logotype originally created for Yves Saint Laurent by the legendary graphic artist If you cannot find the official version free,