Vintage 1970s size 8 floor length gown.

Vintage 1970s simple, floor length burnt orange colored gown in excellent condition! The tag inside says size 18, dry clean only but I'm guessing it is close to a womens size 7-8. The measurements are: 54" long (from top of straps to the bottom). 34" bust. 36" waist. I believe this dress is made of polyester.