Short sleeve gap sweater size medium

Short sleeve gap sweater size medium. Sweater is 58% cotton, 32% acrylic, 8% nylon, and 2% spandex. Pit to pit is 16.5 inches and approximate length is 21 inches. If you look on the photo of the back near the neck there appears to be a small stain however it is not a stain. It’s actually the sewing from the tag. The color of pink is slightly brighter than shown in the photos, but it is a very subtle difference.