I decided after much trial and error to try a hand-stitch on the zipper. After breaking a needle and jamming the sewing machine several times, it was really my only option. It turned out to be my best option. It came out very clean and professional looking (pats self on back).

I had to go back and cut away the excess fabric on the inside of the waistband that was left after I added the finishing stitch:

After doing this, I tried the skirt on again. There is a weird curve underneath the waistband now and you can faintly see the seams and darts through the linen fabric. I’m contemplating on lining the skirt. What do you guys recommend? Would releasing the darts a bit underneath the waistband fill out this unwanted curve? Also, what are your thoughts on cutting away the excess fabric where the darts are? Keep in mind that you can only faintly see it and I am probably just being too much of a perfectionist so it may not be worth it.