A main aspect of DCG is putting together outfits with a certain number of style points, be it for career tasks or missions. Shops give the player somewhere to pick up new pieces for their Wardrobe.
Different stores sell different clothing styles and some stores only specialize in one type or another. The following icons easily show what each store sells.
Lusso was only available when visiting Venice during the Venice Vacation travel journal mission in Summer of 2013 and thus is no long accessible.
The Vault is a VIP-shop - here you can pay only with diamonds.