Eco tie front bikini top in aloha print

Super cute print but runs large. Straps are not adjustable so I'll have to take to get altered. For reference I'm a 36B and purchased Medium.

First of all, I HAD to have the Aloha print. I love it. It is even cuter in person, if that's possible. I'm usually a large in J. Crew bikini tops (a 36C). Initially, they only had the M, so I ordered that, hoping it would work. Then the L came avail so I ordered that. They arrived at the same time. As it turns out, the large is WAY too large on me, and even the medium is a bit large. I prob could've gone with a small on this one. Who knew? Also, there is only one photo, from the front, and the description didn't speak to any back detailing, so I thought the tie-front was maybe decorative and it still had a back close. There is no closure in back. This is like a front-close bra (which is my preference and I love) and only closes by tying the front. Thought it worth noting, especially if you like unhooking the back for sunbathing. You can undo the front, but not the back.