Tecmo recently updated the Ninja Gaiden Sigma 2 cast's wardrobe, offering style savvy ninja masters new, sometimes inappropriate attire for Ryu, Momiji, Rachel and Ayane. If you didn't download the pack, here's a revealing look at what you've been missing.
Frankly, I think the four bucks is a small price to pay to improve upon Ayane's look and give Rachel something more business-like to wear. But it's also four bucks worth of virtual clothing. You'll have to judge for yourself.