Plackets are made in double layers to provide strength and durability to the opening or slit in a garment. Since plackets undergo frequent stress and movement when the garment is worn or removed, the double layer prevents the fabric from stretching, tearing, or fraying along the edges.
Additionally, the double-layered placket offers a neat and clean finish, supports the attachment of fasteners like buttons or zippers, and maintains the shape of the garment opening over time.