Description from Knitty.com:
A brief note on fit: The size L sweater fits nicely on a 42" bust. There’s a fair amount of ease built into the pattern. So, please select a size 3-5 inches larger than your actual bust measurement.
I chose a simple, slightly longer, shaped cardigan, accented with cables-and-eyelets along the raglan lines and finished off with a short-row shaped collar. The pattern is easier than it looks, and knits up quickly on US 10/6mm needles.