Eileen Fisher Black Silk Blend Top Features vertical "vent" detail lines on each side, as shown in pic. Fabric does have some stretch due to silk blend with spandex. Very lightweight and classic staple piece for any summer wardrobe. Women's Size Medium Approx 21" armpit to armpit, flat lay measurement. Fabric: 95% Silk, 5% Spandex Shirt is in great pre-owned condition. See pics for details and measurements.