Mini Starlet Top in Blue & Lilac, it is size adjustable max. one size up or down.
 
Size XS-S & S-M have slim elastics and smaller starlets.
Size M-L & L-XL have wide elastics and medium to large starlets.
All sizes have adjustable straps both in the front and back. 
 
Product also available in different colors and fabrics, all made from leftover cutoff/deadstock lycra.