Give the colour a dark foundation
The green chunky-knit sweater appears with dark trousers in the photograph. That simple division lets the colour remain clear. Begin your version with black, navy or charcoal trousers you already own. Another prominent upper layer is unnecessary if the green is the detail you want to show.
Try paler trousers if the dark lower half feels too severe. They change the contrast without changing the basic idea. Keep the bag and shoes neutral during the first try-on so you can decide whether another colour adds anything or the sweater already provides enough interest.
Leave room around the roll neck
Fold or arrange the neck so that it does not squeeze. A tall collar does not require a double fold if that produces a firm, bulky roll. Check how it feels when turning your head and sitting rather than judging only an upright pose in the mirror.
An additional scarf can create considerable material around a chunky neckline. Decide whether the temperature requires both. If so, placing the scarf outside the coat may help when it stays comfortable there. A thinner inner layer can also create room without changing the visible green sweater.
Check movement beneath the coat
Put the intended coat over the sweater and fasten it completely. You should be able to move your upper arms forward without the knit gathering heavily. For a longer journey, that combination matters more than how impressive the sweater looks on its own.
Large stitches and a winter colour do not establish a particular level of warmth. Choose extra layers for the actual garment. If you move between outdoors and heated rooms, wear a top underneath that you would enjoy wearing alone. That gives you flexibility instead of requiring the thick sweater to stay on regardless of the indoor temperature.
