Add the key layering piece: a cropped jacket. When you're wearing a strapless dress, any jacket that's too bulky or long is just going to overwhelm you and drown your dress. With a fitted, cropped jacket, you create a more appealing proportion and can really show off your stuff. Also make sure you're starting off right: Even if the dress fits you like a glove, wear a great-fitting strapless bra for support.
Wrap a belt around your waist. If you're going for a more casual look, use a pretty ribbon belt or one with a fancy buckle. If you're going for an elegant evening style, opt for a seamless, thick belt instead.
Keep the look feminine and pretty with a pair of heels. For a daytime look, a shorter heel works; think a pair of strappy sandals or wedges. Dress up your look in a pair of sky-high peep-toe pumps.
Go minimal with your jewelry. You want your dress and jacket to make the fashion statement, so keep the rest of your look relatively simple. Choose a pretty, shorter chain necklace along with a couple of metallic bangles or a slender diamond bracelet.
Finish with the right bag. A handbag is suitable for daytime when you need to carry around all the essentials for your busy day on the go. A clutch is better for evening, to keep the look sleek and sophisticated.