I did find that the carrie hoodie ran small rel. to a shak. My shak is a small and fits well, but the only carrie hoodie I tried on was a medium and also fit similarly, at least in the bust, but then I think it was too loose in the waist and hips. I didn't care for the 'boucle' weave. Its very rough when it touches your skin, and its not shaped so it just looked like a very expensive sweat shirt to me. On the other hand, GLC/Catherine looked great in the pic of her in it, that it must really depend on body type. I too am big busted, and maybe its just not that flattering for that body type. Its hard to say how warm it is, since I only tried it on in a store, but I'd guess its comparable to a shak, or a piece to layer over a shak if you want extra warmth.
But Knotted, I still think if you don't love it you should send it back. I struggled with this a lot, but in the end I am glad for my rule of only keeping pieces I love. It was funny, I went through that coat shopping in Boston on sat. I tried a lot of coats on, but didn't love any of them so I didn't buy one. Then my daughter's friend shows up in a coat I LOVED, I tried it on, I wore it for the rest of the day (she was so sweet to trade coats with me for a while), and I ordered it knowing I really LOVED it. Same thing when wool pants/suit shopping. Almost bought a suit cuz they had the top and bottom both, and while they fit me, I didn't love them, so I bought a different pair of pants I loved instead, and then while in boston I found the matching jacket, so now I have a suit I love. I like the love rule.