Tie-front bikini top in classic stripe

I’m normally a small on top, and found that I barely fit the xxs (I had to cinch it so tight just so I wouldn’t expose myself).

I bought based on another J. Crew bathing suit top (more of the French-style top shape) I have in a small (34B for reference). Have exchanged for an XS but don't have that to compare yet. Front tie is only closure and straps are NOT adjustable (I expected a back hook closure with the front being decorative or extra to adjust fit). I love anything navy/white stripes so I hope sizing down solves the issue!