outseam

This term is a technical specification used primarily in tailoring, dressmaking, and garment construction. It refers specifically to the outer edge of a pant leg, distinguishing it from the inseam, which runs along the inner leg. Because it is a precise measurement of the garment's exterior length, it is frequently used in sizing charts and alteration requests.

In a professional sewing context, the outseam is critical for determining the overall silhouette and drape of trousers. Miscalculating this measurement can lead to a garment that is improperly proportioned relative to the wearer's height or hip width.