In the case of a high roll or stand collar, the upper collar's seam allowance is reduced in order to reduce bulk and create a smoother and more streamlined appearance. This reduction in seam allowance helps the collar to sit properly and maintain its desired shape when it is folded or turned up. By reducing the seam allowance, the excess fabric is removed, resulting in a neater finish. Additionally, reducing the seam allowance can also help to make the collar more comfortable to wear by reducing any discomfort or irritation caused by excess bulk.
