Sleeveless collared button up white shirt dress

A. Calvin by Flying Tomato Cute preppy white shirt dress. Collared, button up, tie front waist, sleeveless. The perfect layering dress. Some spandex gives it a comfortable stretch. Tagged as a large, but please note measurements: 18” pit to pit 17” waist 34” shoulder to hem Some faint staining at underarm and one faint stain on the front - I have tried to photograph both as well as possible but they are quite light and could possibly come out with laundering.