+1 for Hitomi's denim gear and Helena's Arabian dancer dress
Also, Tina's DOA2 C1, Leifang's DOA2 C5, Ein's DOA2 C1/C3 on Hayate, Opera dress for Helena, Christie's DOA4 C3, Kokoro's DOA4 C6 and anything that shows Ryu's face. Also, I think Eliot would look really good in a light blue dress...