An outfit for an angel on assignment in the Arctic, helping human scientists research climate change. A very noble cause!
(Naturally all the angel would know about the Arctic is that humans find it 'cold'. So why not just wear multiple layers of everything!? That must be what the humans do, right)!?
Let's have multiple woollen jumpers, multiple socks, multiple scarves (one of which looks a little demonic, but humans are known to sin occasionally, so that's fine, it will help with the 'blending in' part). Biiiiig boots to help traverse in that beautifully white but rather pesky s-no stuff. Gloves... Wait, what is a hat? Humans lose most of their body heat through their heads!? That sounds fake. Most likely demonic nonsense trying to confuse us. Don't humans have anything like a halo to help offer them heat and light? Surely they have something like that. Won't bother with a hat then. A coat with lots of colours because humans seem fond of colour. Gold and beige are best of course, but if we are trying to be like them then... Oh, better have an extra eye somewhere, to help look out for demonic wiles and any danger. On the back will do nicely. Simply must have a holy sword as well. You never know when you might run into a member of the 'opposition' in need of some smiting... or a 'pole bear'. They sound rather ferocious.