To wear this set, simply put on the crop top first and then the fitted dress. It's suitable for daytime events like brunch. When it comes to maintenance, remember to hand wash it in cold water. Don't use hot water or a washing machine as it may damage the fabric. After washing, hang or line dry it instead of using a dryer. As for sizing, the set fits true to size, so choose your regular size. If you're in between sizes, you might want to go for the larger one for a more comfortable fit.