Cardigans may be a staple in your grandpa’s closet, but trendsetters like Kendall Jenner, and Emily Ratajkowski have proven that ʙuттoned-up knitwear can also be cool, Sєxy, and youthful—even in the ᴅᴇᴀᴅ of summer. The key to pulling off a summer cardi? 

Choose a shrunken silhouette, and leave it mostly unʙuттoned, paired with summery pieces like shorts or a slip dress. Or, as Megan Fox has just shown, you can style a whole look around a cardi and a color.

Stepping out in L.A. yesterday, the actor opted for a fiery red ensemble that accentuated her Jacquemus knitted cardi, which was worn without a top underneath. Styled by Maeve Reilly, Fox paired her long-sleeve sweater with a high-waisted skirt, also by the label, and a red top-handle bag to match. Strappy ɴuᴅᴇ heels by Femme LA, meanwhile, lent a dressy, evening-ready finish to it.

It’s not the first time Fox has given the cardigan a Sєxy, vampy finish. Back in April, she also wore a Versace striped knit with a white shirt dress and staggering Louboutin platform boots. But there’s something about this latest styling job that makes a huge statement that’s worth replicating this summer. Like a red traffic light, the fit commands you to stop and pay immediate attention.