TM always wears these wierd sack dresses with her arms out. It's wierd, for someone who loves clothes so much, it's like she has a mental block about High Glam.
I really don't get the American obsession with shirt dresses. They're all at it. Crazy about the whole collar and rolled sleeve thing. Maybe they think it's preppy. But the fabric is too heavy and stiff here. It's like upholstery fabric.
I actually do think that the Orders and sashes do dictate a fair bit of what you can wear. You see it a lot in the formal gowns of CP Mary, who is forever having to wear that stuff, and they have this heavy elephant insignia. You have to really think about the construction of the bodice so the sash lays nicely. The sashes also have to be pinned front and back of the shoulder so you need fabric it can be pinned on to. Melanias mesh bodice might tear with two diamond brooches stuck into it, for example. And then you have the big bow order which frankly looks dreadful unless it is almost camoflagued against the background colour.