Please note this has not been dry cleaned or pressed.
1964 Prom Dress was likely a size 7 and was taken in a bit in the back.  Double spaghetti straps (one set aged in color).
There is some staining/aging around the top lace edge and bodice is separated from lining in top front.
Skirt consists of overlay sheer material over white unknown material (could be Taffeta?). Some of the sheer overlay is aged.  
Skirt has a front false wrap with waist bow.  There is separate netting underneath the skirt for fullness.
Measurements (approximate):
Skirt length 39"
Bust is darted and have stays front & back, 31"
Waist, all around 24"

Questions are welcome.  I am a pet household.