Sega announced downloadable Aliens Vs Predator items in the Threads Store inside the Playstation Home Mall for your avatar. There are a male and female version for each species in the game. You can buy them as complete packages, but also available to download separately. They wont be around forever though, you can only get them through March 31st.
€2.99 (4.113642 U.S. dollars) for a complete costume.
€1.99 (2.737842 U.S. dollars) for a pair of trousers or a top.
€0.99 (1.362042 U.S. dollars) for a helmet or mask.