its really stupid if you ask me. Just one thing, IF they did make a DLC to add costumes, I hope they wouldn't give us sailor chris. If you don't know what I'm talking about, look it up. Your eyes will practically burn.
I don't mind that the 3DS version didn't get the DLC, I would have liked it but I certainly don't need it due to the brilliant amount of content within the game already. Plus, I have the Xbox 360 version and I completed it but I find myself constantly going back to the 3DS version because of the 3D, touchscreen controls and the use of laser aiming rather than reticle (gyroscope controls are great too)