Maker/Manufacturer:   Dennis Goldsmith.  I had a similar dress in the 80s that was by Norma Kamali.   
Fiber/Material:  100% cotton, Unlined.
Size:  marked size S, fit is small.   Estimated measurements below
Condition:  Excellent vintage/pre-owned.   Dress has slight drop shoulder, probably originally had shoulder pads.

Shown on dress form 31 1/2"-24"-34"

Estimated measurements/taken flat then doubled at rest:

Bust:  32"  
Waist:  28"
Hips:  36"
Neck back to hem edge:  34"

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