A tuck and a belt would look great, as long as the waist and the rise length works in the pants (not all of mine work for this). Still, a silky blouse loose like this is very luxurious and free -- and it won't wrinkle as much, if you wish to wear it again before laundering.
I think you've chosen a gorgeous color, rich fabric, excellent fits, and finishing touches in the sleek flats and the necklace.
Sometimes "simple" looks absolutely right. And overheating is the pits.
