Super cute shirt!  Fabric is a slightly puckered lightweight cotton of two widths of stripes. I am not sure that the fabric is seersucker, (maybe plissé?) so I don't know if the puckers will relax after the shirt is washed. Smoke free home.

Bust, armpit to armpit--approx 19"

Sleeve length, measured along underarm seam--19"

Length--19"