One piece. This fashion Graceful Gleam Sequins Strapless Dress features intensive glittering sequins throughout on top. Hollow-out on back with a wide elastic contraction band. Two-layer sweep, ruffles trim on upper layer and straight bodycon hem on lower layer.SIZE MEASUREMENT: Small: Bust 32.28-33.46, Waist 24.41-29.13, Hip 31.5-37.01, Length 23.23 (inch)Medium: Bust 33.07-34.65, Waist 25.98-30.71, Hip 33.86-38.58, Length 24.8 (inch)Large: Bust 33.86-37.8, Waist 27.56-33.86, Hip 35.43-40.94, Length 25.59 (inch)