From Merchant & Mills:
Nautical Boat Neck Casual Top - Inspired by the working men of a seaboard, fish-eating nation, this is an easy-to-make, lightweight top with a simple boatneck collar and small slits at the sides. It is best made with a crisp cotton for an architectural silhouette or a soft linen for a more relaxed statement. The top is loose fitting like a t-shirt and slips over the head in a jiffy.