Since the color and silhouette are so basic, I'd look for one with a few defining details; perhaps a lace-trimmed hemline or slouchy pockets. Those kinds of little extras won't make it any less versatile, but a lot more special.
Relaxed, refined and just a little bit badass, slouchy kidskin pants are way more versatile than you'd think. If you're worried about the aggressive-ness of all that leather, balance it with conservative shoes and a demure silk blouse.
Because neck-hugging necklaces are already so overtly sexy, I like the idea of wearing them with something that's not, like menswear, denim and loose fit pants. (So basically, most everything in the slideshow.)