A very cute swim suit. Alas, I cannot recommend this for G+ cup sizes. I’m a US 34H/36G (UK 34FF/36F) and I’m well aware that a bandeau is never going to be the most supportive style for me, but I held out hope. It fits true to size, but the fabric beneath the underwire folds under and the halter strap unfortunately doesn’t prevent the top from migrating downwards as you move about. I tried sizing down to a 32I to get more support from the band, and although it held me up better, I got double boob in the cup area. The mesh lining in the top is also quite uncomfortable.
If you’re a larger cup size and really want to try this suit, it could still be a good option for sun bathing. I’d be nervous getting much more athletic than that in this style. If you’re in between band sizes, I recommend going with your smaller-band sister size, or even better, buy 2 sizes to compare. Otherwise, it fits true to size.