Understood, though what some people have evidently failed to take into consideration also is that the photo with her back facing the lense was taken outside, thus the nuisance of natural light combined with flash photography impressioned the royal posterior. It happens. The nude colour of the evening dress unfortunately highlighted it.
Furthermore, has anyone contemplated the possibility of a breeze?
Sure, Mary probably would have been best to have worn a different evening dress of a different colour but by all accounts, the dress appears to fit well. It is by no means a favourite of mine, but if it didn't fit I'd certainly state as such.