A shirt collar triangle patch is a small, triangular-shaped piece of fabric typically made from the same material as the shirt itself or a complementary fabric.
It is strategically placed at the neckline where the collar points meet, serving both functional and aesthetic purposes. Functionally, the shirt collar triangle patch reinforces the collar area, adding durability and stability to this high-stress area of the garment.
By providing an extra layer of fabric, it helps prevent wear and tear, prolonging the lifespan of the shirt.