Congrats, linquest. I bought the same size. It's a bit big on me, but I thought that the 10 didn't give me enough room through the shoulders to put my arms forward. I'm hoping to get mine tailored sometime this winter to be a little more fitted.
That's what I was thinking, that it will be much too big for you. If you're looking for a melton, PM me, or I'll look for your email on one of the Coth hunt mailings. I have a very nice vintage melton that I found on eBay for a very good price. I'd be happy to send it down to you to try. It's too small for me, at least for riding.