I bet you have never heard of this before. I have because a few of my relatives did this as their profession for years. Hatcheries hire "Chick Sexers" to separate the male and females (females are more valuable because they lay eggs). This shirt is in their honor.
This is a Bella Canvas shirt made in the USA - 100% combed and ring-spun soft comfortable cotton, 4.2-ounce and 30 singles, side seams with a retail fit. Shoulder to shoulder taping.
Size - Chest width (order one size up if you prefer a comfortable fit)