Hershe swing dress with keyhole opening in back. Teal/blue 3/4 sleeves. L/XL?

Blue/green swing dress without material or size tags (see measurements included) Material soft and stretchy. Keyhole back, button at neck. Rounded neck, side pockets. length: 32 inches, AP to AP: 19 inches. Sleeve length: 16. Excellent condition, from smoke free seller