I upcycled vintage kids' pants to create a detachable collar for adults. This detachable collar is new. It has a simple round collar shape, making it easy to pair with T-shirts, sweatshirts, sweaters, and turtlenecks. It can be easily removed with snap buttons. It's reversible, with brown corduroy on one side and a blue check pattern on the other. I actually wear a detachable collar myself, and when I'm rushing around in the morning and feel like something's missing, it adds a nice accent to my outfit. By wearing a detachable collar, the base of my neck feels warm, and I've discovered that it's perfect for the changing seasons, even if it's not quite a scarf or neck warmer. It's compact, so it doesn't take up much space when removed and put in a bag. Also, it's not bulky when wearing an outer layer. Size (flat measurement) Neck circumference (inside): Approximately 42 cm - The vintage item is only the kids' brown corduroy pants. - Please wash by hand or in a washing machine using a laundry net. - This is a handmade item by an amateur, so please understand and accept any imperfections such as uneven stitching, double stitching, or re-stitching before purchasing. Thank you for looking.