As for her own style in influences or icons, “I’m my own muse,” Welch says.

Welch moved to L.A. in 2001 and started working toward her long-held “Secret goal” to be a stylist, first producing her husband’s shoots and soon striking out on her own-albeit in a far less glamorous position than she has now.

While Welch may be her own personal style inspiration, each time she works with a new celebrity-whether it’s Olivia Wilde or Justin Bieber or Kaia Gerber-that client becomes a kind of muse, in a process that Welch calls “Organic and a little hard to explain.” Welch focuses on drawing out aspects of each person’s personality-Sarah Paulson’s strength and elegance, Wilde’s boyish sexiness, Ruth Negga’s romantic, gothic side-and channeling it with, say, a sleek suit or frothy ruffles.

She’s also never been one to shy away from expressing her inclusive political views on social media, and she works with similar-minded clients: During Elisabeth Moss’s press circuit for The Handmaid’s Tale, Welch dressed Moss in socially conscious designers, like Rosetta Getty and Prabal Gurung, and encouraged her to accessorize with ACLU and Planned Parenthood pins.

This past spring, Welch partnered with Hanes to launch a line of white T-shirts, ideal for the kind of effortless uniform dressing that Welch herself loves-with a nod to famous white T-shirt wearers from Marlon Brando to Carolyn Bessette Kennedy.

To dress well, “You have to be able to know yourself,” Welch says.

Want to try a long black dress or a slinky suit, but not sure how to style it? Welch to the rescue!