Cardigans worn as outerwear, from long open shapes to cropped and buttoned versions, and how to keep them sharp.
Cardigans Worn as Jackets
A cardigan becomes a jacket when it has weight
The reason some cardigans work as outerwear and others look like something you have thrown on is almost entirely weight and finishing. A cardigan that functions as a jacket has a dense knit, a substantial button or no closure at all, a collar or a clean neckline that stands rather than rolls, and ribbing firm enough to hold the front edges straight. A thin lounge cardigan has none of that and will always read as an indoor layer. Length is the second variable: a long cardigan reaching mid thigh replaces a light coat and works over a dress, while a cropped cardigan sits at the waist and behaves like a jacket over a trouser. Neither works over the other kind of garment, which is why one cardigan rarely covers both jobs.
Fibre, structure and the sagging problem
A cardigan worn as a jacket takes far more strain than one worn indoors, so fibre matters. Merino and wool blends recover their shape and resist the stretching at the elbow and front edge that ruins a cotton cardigan within a season. Cashmere is beautiful and the wrong choice for something worn as outerwear, because it pills at every friction point and a bag strap will mark it permanently. Look for a knitted in placket rather than a stitched on band, since a stitched band eventually ripples. Pockets should be set into the knit rather than patched on, or they pull the front out of line once you put anything in them. And check the shoulder: a dropped shoulder reads relaxed and a set shoulder reads sharp.
A note from the Phia editors
We now buy cardigans with the same criteria we would apply to a blazer, which sounds excessive and has stopped us buying the wrong ones. Dense knit, firm ribbing, wool rather than cotton, and a colour that works next to the trousers already in the wardrobe. Worn open is the default, and it hangs correctly only if the fabric has enough weight, which is the single easiest thing to check in a shop by holding the front edge and seeing whether it falls straight. If you take one thing away, treat the cardigan as outerwear when you buy it rather than when you wear it, because the pieces that survive that test are the ones that end up replacing a jacket.
