What is an "armhole"?

An armhole is an opening in a garment that provides space for the arm to pass through, typically located where the sleeve joins the body of the garment. The size and shape of the armhole can affect the comfort and fit of a garment. A well-designed armhole should allow freedom of movement for the arm while also fitting snugly against the body to avoid excess fabric and gaping. Armholes can vary in shape and size depending on the style and purpose of the garment, and may be finished with a binding or facing to create a neat and sturdy edge.