Gap 100% silk cap sleeve sheer blouse

Gap 100% silk sheer cap sleeve v-neck blouse (fabric content tag is missing). Measures approx. 19.5” pit-pit, 16” under bra line, 23” length from top of shoulder. Invisible side zip. Tag indicates size 12 but measurements are more in line with a medium which is how I’m listing it. Worn once & in excellent like-new condition.