I've seen uniqlo do thin down jackets that are supposedly to wear under you coat I assume to keep you warmer. I like the idea because I prefer to wear a wool coat rather than a big down one but when it gets cold they're just not as warm. However I wonder if it's just all a bit bulky and uncomfortable. I don't want to buy one if it'll end up being a waste on money. No Uniqlo shops in the North so would have to orde/pay postage etc.