In very good condition!
However, as you can see from the picture if the back, it's actually fairly sheer and definitely should have a bodysuit or slip worn underneath.

Brand is Tanglewood.
No size tag, shown here on a small.
Best fit medium and may even fit a large, do see measurements.
The elastic in the waist is very good.

Detailed measurements:

Bust - 38 inches
Waist - 27 inches
Hip - 42 inches
Body Length - 37 inches

This item is sold from a vintage seller in Central Wisconsin.