Slot - is a cut in the garment, specially treated. Slot is usually for freedom of movement, for example, in the back seam of skirts, dresses or on the back of a classic English coat.
Unlike conventional cut one half slots overlaps an other - the so-called left and right of the cloth, which are held together by stitching laid diagonally. Besides the fact that slot allows freedom of movement, it can perform a decorative function. For example, if it is made of a contrasting color to the main product material. At first slots were made only when sewing costumes for riding - to coat the freedom of movement of the rider. But over time, this element has been applied when cutting the rest of clothes.