Okay, these models are like six feet tall and wearing heels, but we can still try. First, don't slouch! Wear well-fitting dark skinny jeans and add a pair of boots you can actually walk in, and practice. You'll get there.
Heard friends using this phrase recently, it captures the essence of these looks pretty well. The way you stand and present yourself matters as much as what you wear. It's all about the attitude!