Urban Outfitters backless maxi sz M

Worn once on a cruise. I really love this dress and I wish it still fit me! Purchased in 2016. This dress is not lined and it zips up the side. This dress is nice and long, a true maxi on me and I'm 5'9" purchased at the UO in Athens, GA, the brand is Silence and Noise Washed on cold and hung to dry. Waist is 13.5" Armpit to armpit 14" Armpit to hem 49"