Because that's exactly the outfit I work out in. Skimpy bra and panties paired with wool thigh socks. It's not like someone else has decided to use a little female sexualisation to attempt to market their product!
The button front denim skirt is so versatile. Add a black crop top and practically any type of sneakers and you are good to go. Via Stella Wants To Die Skirt: Bershka, Sneakers: Vans, Sunglasses: Dior, Bag: Gucci, Top/Belt: Stradivarius.