What is it about models like Australian Miranda Kerr and Brazilian Alessandra Ambrosio that make even their casual off duty looks inspire pangs of wardrobe envy? As it turns out, it might be as simple as a basic clothing item - the t-shirt.

Take Miranda Kerr on a sunny day in New York City. The model's off duty look had an eye-catching Topshop midi skirt as a starting point. The breezy piece came in a jumbled floral print. Instead of agonizing about what to pair with such a colorful skirt, like most people would, Mrs. Orlando Bloom chose a simple, white tank. Easy, right? But then Miranda takes it one step up by choosing luxe accessories. Red shoulder bag courtesy of Louis Vuitton, sunglasses from Miu Miu, nude sandals by Alexander Wang. And that basic tank? It's from upcoming H&M collaborator Isabel Marant.

Miranda pulled a similar trick at another New York City romp. This time her long skirt was basic black, but her t-shirt was a tie-dye Proenza Schouler number. Studded Chloe booties added just the right punch to her look.

Miranda Kerr's fellow Victoria's Secret angel, Alessandra Ambrosio, had a similar off duty style strategy. The 32-year-old was spotted in New York City keeping cool in a pair of printed shorts. Alessandra's eye-catching hot pants had a summery, tropical feel. Like Miranda, she kept it simple by throwing on a white t-shirt and a pair of tan Sam Edelman sandals.

The best thing about Miranda Kerr and Alessandra Ambrosio's off duty style is that it's as easy as snagging a three-pack of white cotton t-shirts or tanks. Just take your trendy piece - floral shorts, printed pants, the Topshop skirt recently purchased online - and bear in mind that this will be the highlight of your outfit. And then, make it look effortless with a simple shoe, maybe another pop of color from a bag, or jewelry, and of course, that soft, easy t-shirt.

For more of Miranda Kerr and Alessandra Ambrosio's off duty style, as well as some outfit ideas, start the slideshow.

New York