what is a collarless sweater called
A crewneck, also written  crew neck , is a type of collarless shirt or sweater with a round neckline that fits around the base of the wearerâs neck.The fabric that makes the neckline on a crewneck is typically ribbed and sewn onto the shirt or sweater as a separate piece.or example, a Henley shirt is a round neck collarless shirt with two to five buttons on a placket down the front. With the buttons fastened, a Henley shirt resembles a crewneck. Another common variation is the mock neck, also called a mock turtleneck.