Lolita fashion is often emphasizing elegance and modesty, with many layers and not much skin showing. Swimwear on the other hand, often focuses on "sexy" and revealing designs, with the options for "cute" adult designs few and far between. Sports-focused swimwear seems to be the best option for coverage, but without kawaii options.
Enter Mermaid Closet, a new brand of swimwear designed with lolita aesthetic in mind! I only just found out about this brand this past Saturday, and am tempted despite the fact I don't swim.
The designs look like they would be perfect for a beach party! This dress, which is my favorite design, comes with a dress, bottoms, lace sleeves/legwarmers, lace collar, and matching headdress/choker.
There are also drawers available separately if you would like more coverage on the bottom in case of the skirt washing upwards.
They would be nice as regular bloomers as well!