Hanes Turquoise Blue Thin Cotton Pocket Single Stitch M T-Shirt USA VTG 80s 90s. The shirt is labeled Medium but it is vintage sizing so it fits smaller.
The shirt measures as follows (approximately):
Length (back of the collar to bottom): 30 inches
Chest (bottom of armpit across): 19 inches
Sleeve (collar to shoulder then down the sleeve): 15 inches