kapusta:
There is no bathingsuit that is Tzniusdig enough to greet Moshiach in so that moshol doesnt work. There are different attires appropriate for different activities. However a frum woman who takes Tznius seriously should feel very uncomfortable and “undressed” in a 2 piece bathing suit. The goal is to always maintain as high a level of Tznius as possible. Even if you arent on the madregah to feel uncomfortable in a 2 piece, you should, and therefore dont dress that way because its not Tznius and eventually by habit of always dressing Tznius the feeling to want to always dress Tznius will come.