Her Costume

One of the first thing I noticed about Vampirella is her white colar around her neck, that upper section of her bra. Why white is perhaps because she was a priestess on her own planet of Drakulon. In
Vampirism, blood is the light and we all know that the ''light'' colour is white here. That would explain the choice of the colour white. Our priests here do have a white colar so maybe the inspiration comes from them to make a part of her costume. Vampirella is a justice symbol too so white is appropriate.White could also be a symbol for Vampirella, to reassure people who sees her as non-violent and peaceful. That she is on the good side. White always say that about someone, perhaps not a certitude but it helps, due to her nature, she therefore prefers to make that statement and being able to go about her business.

So in recap, a white colar because of...

a) Peacefull Intent
b) She is a priestess
c) She worships and respect ''Blood'' (blood is light and light is of colour ''white'')
d) Justice (yes she is about justice in the comics, a lot!)