With Jeans: Button it up with straight or bootcut jeans and flats or ankle boots. Let the hem sit naturally at the waistband.
With Trousers: Wear it open over a fitted tee with straight-leg trousers and simple flats. The smooth layer underneath keeps the textured knit looking clean.
With a Skirt: Pair it with a denim or midi skirt and boots. Wear it buttoned so the cardigan works as the top rather than an extra layer.