I’m a huge fan of layering a sweater over a dress- it’s the perfect thing to wear when it’s not too hot and not too cold.
The trick to nailing this style is to find the perfect sweater. (You can find the exact one I’m wearing, here.) The sweater has to be loose enough to hide the seams of the dress underneath, and short enough to hit you at your waist. I recommend getting a cropped sweater that’s *at least* 2 sizes larger than your reg size.
While you can totally mix and match endless sweater/ dress combos, I prefer choosing pieces from the same color fam for a monochromatic look- that way it looks more intentional and less… homeless.