The right oversized cardigan screams 'cool mom' from miles away, but the wrong one gets dangerously close to sloppy. It's challenging to strike a balance, but Chrissy Teigen nails it, and we uncovered her flattering style for just $25 on Amazon. It's a fail-proof way to elevate your outfit without trying too hard. Teigen wore her Stella McCartney cardigan with an athleisure set, crew socks and slippers for a sleek, laid-back outfit, tying it all together with rich mom sunnies.