How can i make this romper look casual?

I would wear black gladiator sandals with it. Braid your hair off to the side or make a fish tail braid if you can. There are YouTube videos to show you how too. Or you can straighten your hair. Do a natural makeup look to make it less dramatic. As for jewelry, I wouldnt wear too much to tone it down. Maybe some stud earrings and a large ring. I would not wear a cardigan.