The dress is pretty but I understand the issues of the transparent look. A simple solution would be to use a lighter blue inset instead of the nude. The ‘cut out lace’ still would have shown up very nicely. I have done triple takes on some dresses people of royalty, leadership, and the public have worn. As always, a different dress could have been chosen too.
It would be wise of women wearing different materials, try the outfit on and have people take pictures/videos in different lights. Sometimes what appears to be safe, is actually ‘see through’! News reporters, weather reporters sure have shown some things they would rather not. The Queen would have had enough time and help to do this....her aides failed her, but then she may not listen to them.