I am getting a new dress either navy or red chiffon Dip Dye Drop Back Chiffon Dress - AX Paris (http://www.axparis.com/products/-Dip-Dye-Drop-Back--Chiffon-Dress.html) and I am not sure what colour to dye my hair? I have a light skin tone and blue/green eyes.

I don't understand why you want to dye your hair to match your dress. Are you going to wear this dress constantly? What colour is your hair this week?

I was going to dye my hair anyway but I would like it to look good with the dress

Your hair looks good with the dress without being dyed.