Get the scoop behind her "feminine and superpowerful" performance outfits

When stylist Law Roach puts together one of Ariana Grande‘s outfits, he always incorporates four things — a mini skirt, crop top, ponytail and boots. And he stuck to his tried-and-true formula when it came to her new Sweetner tour looks.

“I always like to say if you put anyone behind a screen with a long pony, an A-line skirt, an over-the-knee boot, the first thing that comes to everybody’s mind is now Ariana Grande,” Roach tells PEOPLE in this week’s issue. “I really do think that one of her ponytails will end up in the Smithsonian one day, that’s how iconic I believe that ponytail is.”

So when they teamed up to plan her Sweetener world tour outfits, which kicked off  on March 18, Roach’s fashion approach was to “take her authentic blueprint and make it feel fresh and elevated.”

The result is a mix of designs that play to her signatures while also being “absolutely feminine and superpowerful,” he says. “I want girls to see her and realize they too can become iconic by staying authentic to who they are.”

Below, Roach breaks down the inspiration behind three of her looks.

Roach played on the star’s love of the Disney icon for the pink two-piece design by Ngo, which he paired with white boots. “Ariana’s really into fantasy movies and characters, and this is the ultimate whimsical look,” he says. “I just want to call her fairy princess.”

Credit: Everett; Kevin Mazur/Getty

He also wanted to deliver a range of “warrior-princess armor” for Grande, which is shown through this orange bra top by Michael Ngo paired with a skirt and boots by Unravel.

Credit: Courtesy Unravel; Kevin Mazur/Getty

Thanks to her throwback-themed music video for “thank u, next” which paid homage to movies like Legally Blonde and 13 Going on 30, Roach tapped another rom-com hit to inspire one of her looks. Roach worked with Versace to create a plaid look worthy of Alicia Silverstone’s Cher Horowitz character in Clueless. “The team at Versace had someone fly the costumes in from Milan to hand-deliver them to me,” he says.

Credit: Everett; Kevin Mazur/Getty

And with every outfit, Roach dresses Grande in 6-in. double platforms, which he says she wears with no complaints. “Every single shoe she wears is a platform, and to this day I have never heard her complain,” Roach says of the 5-ft.-tall star. “I call her Magic Feet.”

— Reporting by Sharon Kanter