The animals in Tokyo Jungle can equip items of clothing, and acquire bonuses for complete sets. This is because Tokyo Jungle is the best game ever. Look at that buffalo dressed as a bear. Sold.
Th screens below come courtesy of All Games Beta, but Andriasang has some details on how the system actually works. Some of the benefits complete sets provide include protection from disease, higher attack strength, and increased health.
Tokyo Jungle posits a post-apocalyptic world in which humans have vanished, and animals must learn to survive in a decaying urban environment. The PlayStation 3 exclusive launches in Japan in June, with no international release confirmed despite my sending flowers to every SCEJ executive I could track down.