Unfortunately I was mislead by the video which demonstrates how to measure yourself, and for the hips I measured across my hipbones, which was not the fullest part of my hips and rear. Therefore when the dress arrived it was too small around the hips. Luckily though, the seams had enough in them for a dressmaker to take them out so that it fit perfectly.
I read a recommendation in another review to add 2.5cm onto the height measurement to allow for heels. I am 172cm and I entered 174cm. I wore low 5cm heels with the dress and it was the perfect length.
The dress was excellent quality (boning in the top meant I didn't have to wear a bra, and heavy material in the lining meant it sat beautifully) the dress was very flattering and I received many comments on how amazing it looked.
All in all I was very happy with it and can't wait for an excuse to wear it again :)