/cgl/ - Cosplay & EGL

I've had this dress for a while and am sick of wearing it with only black (like the picture on the left). I came across this blog photo with a navy blouse and although I like it, it seems quite difficult to get it to work given that the dress is black and purple with big chunks of black (and black x navy is polarizing at times it seems). The purple is a bitch to match, and I do not own the matching headwear, only matching socks. Is well-colourblocked navy something that might work here? Maybe navy shoes and bag, or am I doomed to look like I got dressed in the dark? I do have a purple and navy hair accessory that picks up on a similar purple to the ribbon on the edge of the border print, so that could help it look more intentional.