It's done! My first completed garment in my Handmade Summer Wardrobe Plan is this Grainline Studio Scout Tee in Nani Iro cotton double gauze in the red dot "Pocho" pattern.
It took me three days to sew this shirt. On the first day I cut my fabric, sewed the shoulder, side, and sleeve seams and serged to finish the fabric edges. I also added topstitching to the shoulder seams and side seams. This fabric is very soft in texture and drape and I was afraid that the seams would look shapeless after wearing for a short while. The topstitching helps the seams keep a crisp look.
On the second day, I sewed the bias bound neckline and hemmed the shirt. I topstitched the sleeve seams and hemmed them.
On the third day, I set in the sleeves. When I was sewing my muslin I had my first experience with setting in sleeves. I had to read through four different online instructions before I finally understood how gathering without creating tucks wasn't at odds with physics. It's finicky, no doubt, but completely doable.
I took care to press all of my seams well and my shirt was complete! I wore it out that night and have worn it twice since. It fits into my wardrobe seamlessly and works well with so many accessories I already own. I'm so pleased!
I'm also pleased with the untested neckline alteration; the shirt sits flat against my collar bones now.