Vintage 70s/80s "Pearl Hawaii" Hawaiian Sheath Dress Size 4/6

Gorgeous deep blue sheath dress with a U shaped neckline. There is a single pocket on the right side, and a loop on the left shoulder, presumably to hold a corsage or pin. Lined. Made in Hawaii USA It's such an interesting dress, I wonder if it was a flight attendant or restaurant hostess dress. Very well made. Marked as a size 7, but by modern sizing I think it is closer to a size 6, length is 36 in, please see photos for other measurements. Model is size 6/8, 5 feet tall