Here's a photo of the two swatches that I made.
I contacted Jenna about sizing for the sweater and she sent me this information and gave me permission to share it with others:
A word of caution about ease: that bit you read in my blog was a
quotation from an e-mail I had sent to Amy early on, but that was from
the initial stages--I diverged from some of those ideas later on. Now
that I've seen the sweater on a live, moving body (thanks to YouTube--
if you look at the video embedded in Amy's blog right now
(http://knitty.com/blog) about 1:00 in, there she is), I don't think 4"
of ease is appropriate. I think it's better if it's a closer fit,
maybe 2", if that. (The model--can't recall who it was--was wearing a
shirt, probably relatively thin, underneath.) If you're choosing
between two sizes, I'd probably err towards the smaller one, provided
it didn't have negative ease.
Of more concern is the length. I'm 5'2" and have a bit of an ingrained
bias that way, plus I was banking on the sweater stretching a bit with
wear, despite the fact that Calmer is bouncy. But I don't think the
sample Morrigan has been worn enough by anybody for this to happen
yet! If you're concerned about length, it's easier to alter than the
width; you might want to use the instructions for the larger sizes
(can't remember which, haven't got the book in front of me) because its
length is longer, and use those instructions (so far as length goes)
with your size--you'll be working a longer repeat for the central cable
panel. You can also tweak the length a bit at the very hem, where the
garter stitch edging is.