Now you can buy clothes on your phone, just like a real contract killer. Actually, the Hitman ICA app does a lot more than that, integrating with Hitman Absolution in several interesting ways. You can browse player-designed "Contracts" on your phone and push them to your game, and you can buy weapons and disguises.
There's also an "ICA Database" with various tips and guides, achievement tracking, stats, and more. This seems like the rare mobile companion that just makes the main game a nicer experience! It's free on iPhone and Android.