You have a funny definition of “dumpy”.
Among other points, the low-rise pants emphasize the abdomen while making the waist disappear. They seem intentionally designed to make the most graceful of figures look misproportioned (as I sometimes tell my daughters). I think Mrs. Knauss’s outfit is a somewhat unflattering cut, while I think the flowered pants are ghastly.
Mrs. Trump almost always looks spectacular, in my opinion, but I consider this outfit a miss.