Mine have Challenger coats by Countrymun. They are a brilliant fit. The company were super helpful with my order this time. I have had these in the past and they have outlasted the 2 dogs they were bought for.
As I haven't received them yet I can't tell you how good they are but I like the fact that they are supposed to be light weight with mesh lining as I can use them all year. They come with a fleece liner you can use when it gets cold.
The other really cool thing is that you can personalise them. Admittedly I started using this site because of my blind dog for one of the caution I'm Blind luminous vests for him and now getting him the waterproof as well. (People get worried when he displays odd body language and it explains why)!
They are really good and if you measure your dogs neck, girth and back and put the measurements in the order notes of your order (order the fitting you think best) if they have any worries they ring you before completing your order to make sure you get the best fit for your dog.
Mark Todd waterproof outer, fleece liner - fits both of my dog, stays on through all their antics, and the reflective strip around the belly means I can see them more easily on winter afternoons.