Flattering a figure isn’t about showing off a body. It’s about cutting cloth to fit the body perfectly. I think she deserved a made to measure dress today because she was in the glare of the media. And it is probably that this was made to measure, as the sleeves look longer than the original.
If it was made-to-measure, then it wasn’t well measured or well cut, but I’d also blame the design if the dress itself, which is flawed because it tries to combine incongruous features. The front has two main panels with a seam down the middle, cut to have a gentle curve over the bust. This would usually provide a soft flattering shape. However, the side panels are too loose because they are intended to create a wide opening for the sleeve. The result is that that they cause a fold to extend from the sleeve to the middle of the dress. Essentially, I don’t see how you could get this sleeve design to work nicely with this dress.
I could go on. That’s just one of many things wrong with the dress, from a dressmaker’s perspective.