Cardigans are the epitome of classic cool. The sweater—knit with a button or zip closure at front—has long been a favored fashion item, but was originally worn as part of a military uniform. Invented by James Thomas Brudenell (the seventh Earl of Cardigan) in the 1800s, the sweater eventually found a fan in Coco Chanel, and eventually evolved into a light layer worn by, well, everyone in the 1950s. Couple that with the ’90s oversize grunge era, the cardigan exudes demure and irreverent—and becomes even more stylish when sourced sustainably.

Wool and cotton cardis are a feature at thrift stores everywhere, the varied and easy-to-style toppers available in virtually every hue and from every era. Plus, hand-knit options abound, both online and elsewhere. Slip on over a slip dress, button up and tuck into high-waisted denim, or wear open with trousers for an instantly complete ensemble.

Need a bit of guidance on your journey to cardigan cute? Here are seven ways to style a cardigan—and some sustainable staples to get you started.

How to Style a Cardigan: 7 Must-Try Looks

1. For a Brightly Colored Moment

Brightly colored pants are cool. When paired with a coordinated cardi? Even better. Style a set of saturated trousers with a cropped sweater in a similar shade—bonus points if the purse matches, too.

2. With a Skirt

Style up a peasant skirt with a candy-colored cardigan—preferably with a blouson sleeve. The balance of fits and texture makes for an interesting silhouette that’s sure to turn heads.

3. Layered Over a Dress

A skin-skimming midi dress is elevated with the simple addition of a classic cardigan. Go monochrome, or reach for an in-step, subtle shade for a more casual look.

4. At Ankle-Length

Even the most casual of outfits becomes a full-on look with the addition of an ankle-grazing cardigan. Pair with boots, sneakers, loafers, or even sandals.

5. For Some Printed Punctuation

Add some playful print to an otherwise neutral outfit with a crochet cardigan. We love the floral motif, but any shade will do! Think clouds, leaves, geometrics, and more.

6. For a Winter White Look

When in doubt, go all-white. The strongest single-colored looks are a study in shade, and this bone white cardigan looks best with a bright white pant—before or after Labor Day.

7. Over a Flannel

Go grunge. A pair of oversize trousers, sneakers, and a flannel look suddenly complete (and oh-so-’90s) when topped with a roomy cardigan.