Wear in good health Tunic Dress Long Top

WEAR IN GOOD HEALTH boutique tunic dress. Unique material that feels like a denim linen but there is no fabric tag with the exact fabric makeup. Sturdy structued dress with back zip closure and front pockets. Can be worn as a mini dress or as a tunic top. There is no size tag present. Laying  flat unstretched measurements: armpit to armpit: 19 1/2", waist: 17", and armpit to bottom: 22 1/2".