what colors do you wear with plum?
White. White is also one of the colors that go with many casual dresses, the combination of white with the plum dress will give a contrasting effect. If the pair of shoes have purple laces this will look even more authentic, you can go with this option only when your dress is in a lighter shade of plum. If you dress is in a darker shade then you should try on some other option otherwise the pairing of the two colors will be too contrasting.
Silver. The most conventional choice for formal and semi formal dresses is the silver. If you want to appear more attractive and want to catch the eyes pair the plum dress with a bit more silver accessories like silver earrings, necklace or even a bag.