what is sundance.com?
I love your coat! Where did you get it? If I had seen it, I would have bought it too! Really nice!
And yes, I think you can have it altered. I bought a raincoat from Anthropologie last year and ordered the wrong size by mistake (too big). I didn't want to exchange it - as crazy as this sounds - I just wanted THAT particular coat. So I took it in for alterations and they were able to make the sleeves shorter.