Acacia Santorini Top

Acacia santorini top. Color is storm (black). Size M. True to size. Lightly worn by previous owner. I bought this in an XS and M before finding the small (which is my true size). I’m a 34b (small b) and this fits just a little bigger than I want. When I lay down or bend over the top droops/opens slightly. Would be better for a larger chest size. O81