I'd think classic loli with some dandy influences would be best.
(Exuse my horrid sketch)
Make the body and skirt of it violet, and the underblouse orange. The tie/ascot would be green. I would say... green and purple stiped leggings. High heeled platform green patent leather mary janes maybe?
I'd also think a bright green hime cut would work well.
Try to make your face realistically pale. I'd study the makeup for Mr. Todd in the current movie Sweeney Todd
. Enhance the curve of your eyebrows as well.
(Can you tell I'm a Joker nut?)