Is COS a British brand?

Excuse me, could you clarify something for me? I've been doing some research and I came across the brand COS. Now, I'm a bit confused about its origins. Some sources claim it's a British brand, while others are less definitive. Could you shed some light on this for me? Is COS indeed a British brand, or does it have some other origin? It would be greatly appreciated if you could provide a clear and concise answer. Thank you in advance for your help!