Performance Poplin Popover from Athleta, style 587913.

Band collar, cap sleeves, covered placket, full button front, relaxed a-line shape, finishes on the hip. Sleek stretch cotton poplin in white - see condition note below.

Womens M. There is a faint gray line on the right side chest; color has a subtle blue-ish tint to it.
Chest flat across: 20"
Back length: 27"