Okay, so this question is a follow-up to [Just How Dangerous Would a Plopup Be?](https://worldbuilding.stackexchange.com/questions/196760/just-how-dangerous-would-a-plopup-be) and covers the simple fact that **the bikini didn't exist in the medieval period.**

However, the Plopup have managed to come up with the same concept and are willing to invest heavily in making it a reality. This will be quite difficult, owing to:

**1. Counterproductive Fashions**

It doesn't take a genius to realize that medieval fashion was much, *much* more modest than today's, and that the bikini would be heartstoppingly scandalous for the time period.

**2. Religious Superpowers**

Medieval Europe was split into two by the Orthodox Church and Catholicism. The only other religious superpower in medieval times was Islam, and none of these religions, as far as I know, would favor this garment.

**However,** aside from that, [Plops] can be a cheap source of spandex (please click on the link and see the comments on Dewi Morgan's answer for clarification) and A) when it was first introduced, the bikini was scandalous and B) Classes (like Seamstress and Weaver) ensure the advanced knowledge required to make a modern-style swimsuit.

In other words, **it can be done.** However, the Plopup's goal is to **make the bikini a mainstream garment,** much like it is today. Thus, this question is **How To Successfully Bring The Bikini Into Medieval Times.**

**Specifically,** my question is "how can the Plopup successfully introduce the bikini and make it mainstream when medieval culture and religion would have to change dramatically for that very thing to happen?"

**Please Note:** I'm not writing a story about bringing a modern fashion into a medieval world, I'm just trying to figure out how it can be accomplished. In other words, I'm not asking you to give me a plot or write a story for me.

**You see,** I know the bikini would be unacceptable by medieval standards but don't know how to change that. However, if I don't figure this out, then the second people from Earth come into Alendyias (through a video game, and I believe we all know how fanservice-y those are), the relative immodesty of their clothing will result in huge negative backlash.

**In other words,** medieval culture and fashion has to change before then so people from Earth don't suffer due to fanservice-loving game designers.

**Specifications For Best Answer:**

1. The best answer will take medieval culture (European or Islamic) into account and have a step-by-step process to accomplish the Plopup's two goals (1. introducing the bikini and 2. making it mainstream). In other words, it will name the major changes in fashion and culture necessary to accomplish these twin goals and establish how to institute them.

Thank you for your input and feedback, if there are problems with the question please let me know. Thank you.