I have a wide range of shirts that require collars. The most annoying thing about shirts is that they all have different sized collars that have since been eaten up by the washing machine or forgotten somewhere. Maybe where the infamous other sock resides. Sizes up, because now I can pick a shirt, grab a few leftover collars that work, and I'm on my way. Since there are so many of them, I don't worry that much if I lose them.