Phillip Lim's business is one of the last of its kind standing. "We're one of the few brands left in New York City with an in-house atelier. All the clothes are made in-house," he said, pointing to 3.1 Phillip Lim's new headquarters in Brookfield Place.

Lim encourages interns to appreciate the rarity of seeing clothes go from drawing board to production line, all in one venue. "I'm like 'OK, you guys have the privilege of sitting in the real masterclass here. Really learn from this, because it's disappearing. Now everything is: 'Pop-up, startup. Where did it come from? It doesn't really matter, because we're going to market the shit out of things.' You can't trace it back. But if you come to visit us, you can trace everything back."

On this week's Glossy Podcast, Lim talks about waste and sustainability in fashion, and why going fur-free doesn't mean sacrificing luxury.