This is aつけ襟 (つけ襟 - detachable collar) made by a handmade artist. I've only used it once. I think it's easy to match with any outfit (^o^) It's the type that you slip over your head. Samantha Mos2 Studio Clip Handmade artist Handmade つけ襟 (detachable collar) kfg yosai ten (kfg dressmaking shop) moamaman