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Looking at the previous designs, there is a lot of speculations that can be made about the upcoming ones.
My most likely guess is that we will see a similar design pattern across all kimonos like we see with advent (same level of detail, same flower motif, same artstyle).
Looking at myth/promise, they have very different types of outfit design, with very different color palettes.
Regarding the colors advent all have pretty much their main colors which imo only work because they are darker colors excluding fwmc, who still have some dark elements to match with the rest. Their design works because
even if their colors are light, they mix with white and their blondness.
I dont think this color approach works with justice because their colors are too vibrant to the point where they would sting too much. Im like 40/60 on if they will mix with more colors or a different, darker hue of their main color.
Mixing new colors is difficult with orange, the others have nice combinations.
Now with the pink(ish) holos I can see mori with a black/red mix and mococo with white/black/pink.
My final guesses for raora are either a darker red, or a white blueish design if they go for new colors.