Trimshaper one piece NWT bathing suit size 12

I feel this may run a little small, maybe closer to a 10? It does stretch and I included the measurements. Black. No adjustable straps. Has sewn in padded cups. Rhinestone detail at the chest mid section. Has a separated flap in the front with a little bit of a dress look. approx 16 inches pit to pit 29 inches length BG1*