COSPLAY :D Saya AND Diva from Blood+

OKAY I NEED HELP :D doing a saya Blood+ cosplay from blood, want to buy purple heeled boots, but are they black or purple??? if they are purple i found some on amazon i'd like to get. but if they are black i own a pair :D please help :D Also does the Saya blood splattered t-shirt only sound like a fun idea to do? I'm also making Hagi and Diva. which diva outfit should i do, the final battle where diva dies? or the classic baby blue dress.