She's wearing an ao dai or Vietnamese dress. Quite the rare sight in JP art.

It's a really pretty outfit~

Anybody know the source of this, and whether it's fanart or an original character?

She's sorta reminded me of Natsuki Kuga from Mai-Hime, but it's probably an original character.

All she needs is a baby with a grenade in its diaper ready to blow up some GIs and this will make sence.