You know by now my aversion to strapless dresses (no, this doesn't apply to Gary Oldman, although I wouldn't like him in one either), but if you feel you absolutely must go strapless, best to accessorize with a little bling around the neck. Mainly so that in photos — headshots specifically — it doesn't look like you just stepped out of the shower or something.
Actually there was a lot of 1950s style on the Academy Awards red carpet this year, with Penelope Cruz channeling Sophia Loren in her heyday, and Rooney Mara for instance evoking Audrey Hepburn.
Although she's not in our age group, Michelle Williams' string of diamonds (rhinestones?) makes a nice departure from pearls, but functions with the same simplicity - albeit a little more sparkle. A great choice for the Oscars, even with a crewneck camel cashmere sweater.
Similar situation with Penelope Cruz's lovely necklace and almost geometric earrings, which are an ideal complement to her softly coiffed bob.
Natalie Portman accessorizes with a more upscale version that actually has a bit of a lacy aspect to it, which lights up her face — and the earrings she adds are just right, not competing for attention.
Same with Penelope Ann Miller's simple teardrop-shape earrings and a headband that matches her dress, bringing focus to the face. (Beware of tight straps around the neck though!)
Gary Oldman takes the prize though, not only for best tuxedo of the 2012 Oscars, but also for wearing a little bling in his eyewear — sexy and savvy.