Nina Garcia's Top 5 Style Secrets

Nina Garcia, the fashion director of Marie Claire magazine and a judge on the popular reality TV show "Project Runway," has written a book called "The Style Strategy: A Less-is-More Approach to Staying Chic and Shopping Smart."

She shared five of her own style secrets for looking great without spending a bundle with "Good Morning America."

Her last book, "The Hundred," gave readers a guide to the classic pieces they should have in their closet. Now she's showing us how to stay stylish using what you already own and occasionally adding a twist or embellishment, or mixing things up in a new way.

Garcia's new book begins with a quote from fashion icon Vivienne Westwood: "Buy less, choose well, and mix it all," and she says that sums up her style strategy.

Style Secret #1: Make a 'Before You Shop' List

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There are three questions that help you strategize and economize, Garcia says. Ask yourself: "What do I have? What do I need? What do I want?" When you make your list of what you have, she says to take a thorough inventory of everything you own -- actually go through your closet and drawers and write it all down. The goal, she says, is to focus on what you need and get rid of anything that's poor quality or that you don't wear anymore.

Focusing on what you need means making sure you have the basics: good undergarments, layering shirts, classic jeans, jackets and bags that won't go out of style. Only when you have all of these can you move onto the things you want. Garcia's book has advice on identifying the necessities and learning how to enjoy yourself while shopping for the luxuries, without overspending.

Style Secret #2: Don't Buy Anything Unless You Have Three Items to Match It

Garcia advises purchasing versatile items, such as a blazer that could be worn with a short dress, a weekend casual outfit and a cocktail dress in the evening.

This is how you want to think about each and every purchase, she says. Do these pants go with at least three shirts? Do these shoes go with at least three outfits? That's how you get the most out of your clothes.