Cute flowy stretchy dress ~Medium measure

Adorable dress. Got half of my friend's closet. She is a size M - She buys more shoes and clothes than she can ever wear more than once. Bad habit, she instantly cuts out tags - brand and size. This dress is very comfortable stretchy wrinkle free material with bright vibrant colors. Please measure - Flat on table front side unstretched armpit to armpit about 19.5 middle of back to hem about 31 If by any chance you recognize brand of dress a message would be greatly appreciated.