Your underlay can be a long slit or you can insert a zipper, which allows you to get a snugger fit and no gapping. The long slit is ridiculously easy, whereas the zipper takes a little more time and thought.
If you're choosing a long slit, you cut the center front along the fold line. I do this by laying my underlay along the selvage edge as I'm cutting the shirt out and cutting all sides of the pattern. I told you it was easy.
For the zipper, I add a seam allowance along the center front of the shirt pattern. You could add a 5/8" strip of paper along the center front if you really want, but I find it's easiest just to align the pattern piece 5/8" from the selvage edge and cut it out. If this is a shirt (instead of a dress with a waist seam) trim about 1-1/2" from the center hem. Don't trim beyond the line of your overlay - figuring this will be easy since it's the same pattern piece. The underlay is going to hang free from the hem when you are finished and you don't want it dangling outside of your shirt.

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