This 1970s flouncy little number is by Morton Myles. It has open slits down the sleeves a v neckline with clear rhinestones contouring the bodice. Includes a waistbelt. 
Sold at Lord and Taylor. 
Great vintage condition.
XSmall
Measurements
Bust up to 34”Waist 24-29”Shoulders 14. 75”Length 42. 5”Sleeve Length 23”Sash Length 83”

This item is sold from an excellent, highly rated vintage boutique in Oklahoma City, OK.