I wore this dress to my prom in  1973.  That was it.  Has been in a closet ever since.  It is a classic 70's style dress.  Large waste band,  Working zipper, chiffon style flow, blue liner, ruffle around the neck and arms.  Size 13 for those days was a girls size.

MEASUREMENTS:
Bust: 36"  no more than that!
Waist:  30"  No more than that!
Hips: up to 40"
Length:  55" from shoulder to hem
Across the shoulder: 11"  The dress tappers in when wearing.
Neckline is around 16"  

I would say this is around a size 8-10 in today size.  It has some discolorations but you cannot see it for the fabric.  I bought this due to the TV series "Laugh In".  I am off to my 50th reunion and there is no way any of us can fit into this dress.  Need to pass on.
One of a kind!  Check all the measurements NO RETURNS.  Thanks for looking.