VTG Geary Roark Kamisato Buckle Choker Maxi Dress

Vintage 1980s Geary Roark Kamisato Black Maxi Dress. Backless with super sexy adjustable black straps with gold buckles, back zipper. Choker halter neck with two button back closure. Darted bust. About thigh high slot on left side of dress. Fully lined. 60% Rayon 40% Acetate. Size 6 Petite. Measures 32" bust (underarm to underarm) 28" waist 36" hips, length is about 47" total. Slit up left side is about 18.5" from bottom hem. I would guess that with the darting, this would best fit a B or C cup.