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
Construction and finishing: the outseam is formed by joining the corresponding pieces at the garment's outer