Is this a new fall styling trick?

Mary Kate Olsen
Credit: Getty Images

Cardigans have been trending for a bit now, and while we fully support Bella Hadid’s sexy, single-buttoned way to wear them, Mary-Kate Olsen has another styling idea to try ASAP.

Spotted in NYC on Tuesday (and participating in a habit we don't condone), the designer wore a red zip-up hoodie, black structured pants, black sandals, and round sunglasses, and completed her outfit with a cardigan around her waist. However, it was the way she wore the piece that made us do a double-take. Rather than knotting the sleeves like one would expect, Olsen slipped her body through the neck hole and buttoned up the bottom to keep it in place.

Mary-Kate Olsen Sweater
Credit: Jawad Elatab / BACKGRID

It was a layering trick we'd never thought of before, and one made us wonder how else we could wear this wardrobe staple. Olsen didn't even need statement pants, to be honest; her sweater acted just like a skirt, and without the slacks, she'd have yet another interesting look.

VIDEO: How to Get Mary Kate and Ashley Olsen's Bedhead

We'll definitely keep this one in mind ahead of fall, along with her idea for how to dress up comfy pants.