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Amoruso in a typically adorable ensemble.

It's been four years since Sophia Amoruso launched the wildly popular online boutique, based on her signature with-the-band look that's now—everywhere! “Our customer will wear a little '60s Alexa Chung minidress one minute, and then funky cutoff shorts with big-ass platforms the next,” she says. “The look is sexy, but not in-your-face.”

Click through for her 5 must-have fashion essentials!

1. A Statement Minidress
“The colors, the hem—a bold little mini will get you noticed. The cut is sexy without being too revealing, and a dress is always comfy and easy.”
2. An Embellished Bustier
“So sexy-confident under a blazer with high-waisted pants. Very '80s. I also love the look of letting a pretty bustier peek out from the sides of a big, messy tank top.”
3. A Metallic Bucket Bag
“Keep your outfit simple, and let a shiny, silvery bag be your statement. It has such a cool rocker feel. And I love the easy bucket shape—no zippers, no buckles, no clasps. Just throw in all your stuff and go.”
4. A Bright Blazer
“Why not aqua? It's as easy to wear as black, but so much more unexpected. And even with a giant sloppy rocker tee and cutoffs, a tailored blazer makes you look like you tried when you didn't.”
5. Badass Booties
“Intimidating—but comfortable. The studs and spikes are totally punk and add toughness to any look, but you can still walk all over town in these.”