First I cut the shirts under the bottom edge of the sleeves. I tossed aside the green bottom and pink top.
I cut a more flattering neckline on the green top. I used the melon-colored bottom and traced where the neckline would be. Going about a half inch bigger I cut out the shape of the neckline. I cut about an inch wide section in the shape of the neckline. (see picture)
I sewed the extra piece onto the neckline and then flipped the fabric to the backside and sewed along the edge with a 1/4 inch seam allowance.
I sewed the pink onto the melon-colored piece and I was done!
Do you have any shirts you want to make better?