I like the Night Maiden costume the most (the one that was originally a Kokoro costume). The Marie Antoinette costume looks fitting too since Helena does give off an aristocratic vibe. -1000 for belly dancer costumes though.
I hope the soft engine 2.0 in DOA6 applies to clothes as well as breasts because that would reduce so much clipping. like the clothes pressing against skin or walls or whatever.
Why don't you like the Belly Dancer costume ? I like it better than her old DOA3 one. The details are nice (perfume, jewels), and the cloth on her arms look so good with her windmill moves...