Brooke Shields said she 'hunted' for her size in an outfit that her daughter wore on a magazine cover

• Brooke Shields attended the annual NYC Jingle Ball concert at Madison Square Garden on Friday.
• She wore black leather pants, pointed boots, and a $2,990 Ralph Lauren top with a giant bow.

Brooke Shields might know a thing or two about fashion, but in her eyes, her daughters know even more.

Shields walked the red carpet on Friday night at New York City's Madison Square Garden ahead of Z100's iHeartRadio Jingle Ball concert.

The actor, model, and podcast host wore black leather pants, pointed-toe boots, red lipstick, and a bustier top designed by Ralph Lauren.

The red silk garment, which retails for $2,990, was especially bold thanks to its strapless design and giant bow that sat at her back.

When asked by Insider what inspired her outfit, Shields laughed and revealed that it was her 16-year-old daughter Grier Hammond Henchy.

"My girls and I recently did the cover of Hamptons magazine, and this was what my younger daughter wore," Shields said. "So I immediately went and hunted for it in my size."

Both Grier and her 19-year-old sister Rowan Francis Henchy attended the show with their mom.

The older Henchy matched Shields' look, wearing sparkling black bell-bottom pants and a cropped red blazer. Grier also coordinated in a black-and-gray suit but didn't wear any red. Instead, she carried a sparkling Prada purse.

Shields also noted to Insider that she loved the Ralph Lauren top because it felt "celebratory" and "dressy" at the same time.

But because she was wearing it to a concert, Shields said she wanted to add some edge.

"We funked it up with some more rock and roll pants," she said.

And as it turns out, her red-carpet outfit wasn't far off from what you'd see Shields wear on Christmas day.

"I don't really have many ugly Christmas sweaters," Shields said. "I've pruned them out. I wanted things that only gave me joy. I'd much rather glam it up just a little bit. It's once a year!"