I think it will work really well. The dress is simple and elegant. The doors open for you to go to town on you hair, make-up and accessories. Have you bought this dress yet?
I think the flower will be lovely, However, I am curious... Are you trying to find a dress for the hair style or are you trying to find a hairstyle to match the dress?
If so be very careful, sometimes forcing looks together like that can end in a disaster.This is a bit of wedding planning advice that applies to all aspects of your day. However, I stand by my first statement ... I think it will look lovely.