Well I am glad it isn't just me!
I actually needed 3 metres, told her 3.5 (to make sure) and she ordered 4, which has turned out to be more than 4 now I have looked at it, so I have plenty for the job! The fact that these one metre lengths are actually more than one metre is even more confusing. I am going to measure and see how much there actually is tomorrow! As the fabric is just for the dress and there is plenty for that I am not going to get her to send it back, although I have never come across it before so I will now be doubly checking if ordering from anywhere different to normal!