Outseam

Outseam is the outer seam on the leg of a garment, running from the waist to the hem along the outside edge. It is most commonly discussed for trousers, jeans, and shorts. The equivalent inner seam is called the inseam, which runs along the inside of the leg from the crotch to the hem.

In patternmaking and tailoring, the outseam length is the distance along the outside leg from the waist to the bottom edge. It helps determine the overall pant length and, together with the inseam, affects fit around the leg. Style and rise influence how long the outseam appears; for example, slim silhouettes generally have shorter outseams than wide-leg designs.

Construction and finishing: the outseam is formed by joining the corresponding pieces at the garment's outer edge. It is commonly reinforced with topstitching, especially on denim and casual pants, and may incorporate seam allowances and hemming allowances. In production and alteration, adjusting the outseam length is a common method for changing overall pant length without altering the inner leg fit.