The wild card - every wardrobe needs a wild card. A dress that does all the work for you and you don't have to do anything except add make up, shoes and bag or maybe a cardigan or jacket or coat. I think an item that is a wild card doesn't necessarily fit with current trends or is ever a glamorous number. A fashion wild card works regardless of trends.
It might not be your style and it isn't remotely 1930s or 1970s but this is a good Chanel- esque or even Audrey Hepburn number that will help you out for many an occasion. It will last for years and not really date. If I were you I'd pretend it was vintage...make like Catherine Deneuve in Belle de jour style wise anyway!