On the inside of the collar there is a “pocket” in which you can easily slip in collar stays. The stiff collarbones make sure your collar stays in shape. If you wear the shirt in a more casual way, you can also choose for less stiff collar stays or no collar stays at all. Before washing the shirt, it is better to remove the collar stays as to avoid the collar to wear.
Mail for a free set of collar stays firstname.lastname@example.org