No doubt Keira Knightley is long & lean. And, while Sienna Miller isn't a big girl by any standards, she isn't tall. But slip on a long black maxi dress and the illusion is created. You can also achieve this with tailored trousers, a flattering jumpsuit, an opposing palette and really high heels. Are you up for the challenge? Trust me, it's worth it. The proof is in the pudding. That pudding being long & lean duo Keira (in Chanel) and Sienna (in Jasmine Di Milo) at The Edge of Love photocall.