Keep it simple. If you’re looking for evening wear, sometimes it’s best to go with a super simple silhouette that you can wear again, and again, with different accessories.
Simple bias cut full length dresses seemed to be everywhere when I was a teenager, but apart from Ghost, who do them incredibly well, they seemed to disappear a bit.
Topshop have this super simple low backed satin bias cut shift at the moment. It could be totally 1920s teamed with a rope of pearls and low heeled mary janes, or glamorously, decadently 1930s with diamonds, finger waves and furs.