Mini Starlet Thong 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 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 or mesh and a cotton jersey lining.