Sweet little satin corset top, stretchy material, 3 sizing at super low back closure, no tag but seems to be approx. 34 B, though personally I would wear this being a much smaller size than that - great condition. 

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34 B 

26" Across Bottom 

Length: 11" @ Front - 2" @ Back

Tag: None 

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Model is 5'10 // Size 3 // Bust: 31" // Waist: 25" // Hips: 38"