Skater dresses are lovely for summer attire. Simply wear them as they are, as they do not require any kind of layering when the weather is warmer.
For daytime looks, they can be worn with a pair of flat strappy sandals, pumps or even trainers, depending on what kind of vibe you are going for. If there is a slight breeze, pop a cropped cardigan or shrug over the top, and you are good to go and keep accessories such as jewellery to the bare minimum, a simple pair of studs and necklace will do.
For evening attire, dress them up with a pair of heels. You could add a belt if you want to add some interest to your outfit and sparkle it up with some standout jewellery.