Top shoulder to ribbed base measures approx. 12"; lying flat across front buttoned chest pit to pit is 12 1/2" (totaling 25" all around including both front & back, unstretched);
top out shoulder seam to cuffed wrist opening is 16". Reminder, 100% knit Cotton - so will stretch somewhat for extended fit.
Preowned condition: see photos (no stains, rips nor tears; minimal typical usage wear).
Daughter simply outgrew. Smoke-free home.