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5.
Diver Sleeve Kamilia
Ellowians are not often considered a particularly sea inclined folk. That assumption would be correct for most- but over its eastern mountains and on the stony shores around the calm Bay of Refuge- there is an exclave of maritime culture. The seas that these people fish are not particularly generous, and often, divers must reach into sharp stones and corals and holes after fiercer and stinging sea life. To mitigate the dangers, the fisherfolk wear tight fitting cloth protection that keeps their arms from being cut up, while also presenting as little water resistance as possible, as if the protective sleeves were caught in the stones, they would be of little worth. Given both the expense and the necessity for agility, these "diver sleeves" usually only reach upper body.
Of course, women dive as much as the men, and while traditional diver sleeves do not show very much of the underside of the breast, current fashion has them do so now. There are various stories as to why, but one claim is that coastal women are typically slender, so more endowed women push out where it was not known before. Another story claims that coastal women, lonely and unhappy with their dreary, poor surroundings, sought to captivate sailors and tourists, so their diving sleeves climbed upwards over time to draw the attention of those who might whisk them away.
Thus there is an odd contradiction in Ellowian swimwear where the underside of the breast is more often seen than the top side- though this case uses translucent material, as per the Duchess's wont.
Regardless of the supposed origin story of the (heavily modified) costume of impoverished fishers, a "Wyshkormi," an abbreviation of "eastern cormorant" is a stereotype of a poor and easily seduced young woman, and to "go diving in her sleeve" refers to...well, the open part of the diver's sleeve requires little imagination.
6.
Valsten Swimskirt Emma/Kamilia
While Valsteners are a prudish sort of people, and such extends to their swimwear, this hardly prevents fashionable cuts from being the norm. A top normally is loose down to the midsection, and the skirt, though slit to the belt, worn with another skirt whose slit is worn on the other side. To wear "both slits open" is seen as harlotry by more conservative sorts considering that what is under said skirts is usually but a vertical strip, but to "show light" or "show dark" is beach shorthand for either being fun, or being a bore.
More nautically inclined, a "Valsten Tan" usually is nevertheless only partial. Full body tans are seen as a sign of being working class- any socially conscious wealthy will be sure to have distinct tan lines, which is the purpose of any small amount of exposed midriff. As in Strossvald, the navel is not something to show lightly, even compared to the chest.
This isn't just justification for fanservice, honest.