Large size swimsuits are basically available in a wide range. If you are overweight, you should not necessarily wear the bikini, but there are still oversized bathing suits for you. It's important to find something that flatters both your body curves and your size, especially oversized bathing suits.
As a rule, oversized tops should have an empire waist, which is likely to give a more fluid feel, rather than hugging your body tightly.
There are halter tops, thicker tops or scooped neck tops that are considered very flattering and provide all the support you need to be comfortable and self-confident. As far as swimwear is concerned, oversized swimsuits are usually supplied in traditional briefs, shorts and skirts. Skirts can often be considered flattering, but it can appeal to a large part of the floating public.