What is a gig line?

A gig line is an alignment of the uniform components of a military or other formal dress uniform. It typically refers to the alignment of the shirt, belt buckle, and trouser fly seams in a straight line down the front of the body. This attention to detail is typically expected in military settings as a sign of professionalism and discipline. A straight gig line is important for creating a polished and crisp appearance in formal settings.