1 piece.  The bodice is white stretch velvet with black velvet piping and black velvet covered buttons. Black velvet straps at the shoulders crisscross in back with zipper at back for easy entry.  The pants are black stretch velvet and feature a nice straight full cut. 

Unstretched measurements:

Bust 30"  Waist 28"  Hips 36" Inseam 35"