YSL's "Paris" perfume smells like a classic, vibrant, and romantic floral, dominated by a rich blend of roses and violets, with powdery, woody undertones from sandalwood, iris, and oakmoss, offering a vintage yet fresh and elegant feel. It's a complex scent, often described as smelling like a beautiful, powdery floral bouquet with a warm, woody base, evoking classic Parisian romance.