So, it turns out that the size 10 pattern for McCall's M5800 is much too big! Luckily, I only traced the pattern pieces onto another piece of paper, so the original pattern is still intact. I will need to retrace a smaller size, but now I'm not sure which size: 6 or 8? 4 even? I think some research into McCall's sizing is in order.
However, I did get some sewing done using the McCall's pattern as light inspiration. Using the bodice pattern as a guide, I drafted a bodice pattern for this little yellow dress:
I deepened the V a little bit, and I love this neckline! This dress pattern is meant to be pulled over the head so it is only has some bust darts for shaping.