The problem with that dress was that it didn't fit properly. The black dress that the Queen wore, while a similar style, fit her much better. It wasn't that Diana was more 'busty' than HM. It was that Diana's designers didn't know what was required for the fiancee of the Prince of Wales. Royal ladies in the 20th centuries usually didn't show much, if any, cleavage. Diana's dress needed better fitting. Her style at the time wasn't immodest, and I think that she must have been uncomfortable.
Originally Posted by Moonmaiden23
Prince Charles exited the car first and was widely quoted as gleefully telling the waiting photographers "Wait until you see this!"
or something along those lines....in other words he wasn't exactly dismayed by his fiancée's ultra-sexy evening gown