-Wear black! Not once in the film did I see Ridley wear any other colour!
-Wear lace! Whatever outfit she was wearing she managed to have lace in it. Try layering lace into your own outfits, for example wear a black tank with a black lace 3/4 length sleeved top over it.
-Wear fitted! All her outfits are fitted showing off her waist and hips, it looks really flattering with black outfits because black is a slimming colour!
-Wear minimal! Now I don't mean walk around in your underwear, I mean keep it simple, wear no accessories or one plain one. Also keep outfits simple, for example, just wear a dress, shoes and sunglasses!
These tips will help you look like Ridley in a subtle way if you don't have the confidence to pull off Ridley's dramatic outfits!