A crew-neck sweater is a worthy investment in comfort. Wear it with slim-cut denim or layer it over crisp shirting and pair with dark trousers for the smartest take.
If you're on a thrifty mission, your best bet is this Puma Crew-neck Sweater. It's a terrific item, while not very pricey. Another great option is this Puma Crew-Neck Jumper. While the price is not very high, be sure that this piece will become a great addition to your wardrobe.