Working on my Wyvern

The right front of my Wyvern Wrap (size small) has been growing at a good clip; I'm almost finished with the side shaping increases, and soon will cast on stitches for the right sleeve.  I'm having a nagging fear that the sleeve, which is essentially a drop sleeve, may end up being too snug for this style, at a circumference of 13 1/2 inches for my size.  I think this fear will be best addressed by knitting a little farther, so I can see how the sleeve looks and feels.

I went into my stash for the yarn:  Filatura di Crosa "Trilly," 50% silk and 50% cashmere, which swatched for me at the same gauge as the Kollage Yarns "Yummy" (merino and silk) called for in the pattern.  The Trilly has a nice tight twist--not the slightest bit of pilling or fuzzing, at least so far--and a silvery green color which reminds me of the leaves of an olive tree--beautiful.  I love the texture of the unblocked fabric, but the wrap isn't going to fit me if I leave it that way!