An analysis of online patterns by big data firm Edited shows the runway styles most likely to resonate with shoppers.
The Belgian designer is dedicating himself to Saint Laurent, where he was named creative director last April.
Constance de Polignac joins the French retailer from fashion chain Camaïeu.
Incoming president Mario Grauso will assume the chief merchant role.
The mirror records images and videos of the customer, letting them compare side-by-side images of them wearing sunglasses.
The in-store boutique will open in Los Angeles, Nashville and Toronto.