Farm rio mixed print one shoulder dress

Farm Rio gorgeous mixed print dress in size medium. This dress is a gem...gorgeous fabric , beautiful print, unique side cut outs. Brand new with tags from Brazil. Sadly I bought this and find it's a small fitting medium. I have included the measurements of the narrowest part of the waist (definitely slip this dress on over the head rather than stepping into it!) and the bust. I am 5'9 for reference, usually wear between a 6 and 8 for dresses. also I have added a pic of the zipper as it doesn't go down all the way (not a design flaw but makes entrance small!)