The shirt is done!! The zipper went in really well, and I'm much, much happier with the neckline on this one. I think it'll also help having the lacing more decorative than functional, since it caused weird bunching issues before.
And here's a closeup on the decorative stitching near the top. It's just little asterisk-like stars. I think I'm going to go ahead and wear it tomorrow, since it's done. Holiday rebellion, if you will.