Gran Sasso has knit sweaters in Sant'Egidio alla Vibrata since 1952, and their crews are the reason so many Italian tailors quietly keep one in the drawer. The 23131 is a clean crew neck cut for layering under a sport coat or wearing on its own with tailored trousers. The knit sits close without clinging, the neck holds its shape wash after wash, and the finishing at the cuff and hem is the small tell that separates a mill-made Italian knit from the mass-market crews stacked at every other shop.
Cut through the body in the standard Italian fit; if between sizes, take the larger.