It's kinda interesting to see many of renko's different sort of headgear. Which makes me think that, while some people may like the idea of Renko's hat being actually Sumireko's hat (because, they're related as a family), i rather prefer that, while indeed she may have her hat (And even then, Sumireko also had different types of hats), the other different types of hats (and hairbands) renko have are probably different ones that she may have brought from any clothing store, and she just likes them because of how stylish they are.

This also makes me think that the hat she had on post #4928128 (neo-traditionalism of japan is probably the same one as in Changeability of strange dream or trojan green asteroid. as for the one from Mesmerizing journey (post #4928118) makes me think of Magical Astronomy (even though now looking at it, the border of the hat feels more shorter).

Also, this makes me think that Merry's mob caps may also be different too, albeit mostly the one in dr.latency's freak report stands out because of it's red lines. But the ones in the others (sans Changeability of strange dream and retrospective 53 minutes) feels very similar if not for the frills on it being larger or shorter, or even the tops being soft or not.

As well, all of this just comes because of how much different reimu's and marisa's outfits have changed through history, as well their signature headgears (reimu's ribbon and marisa's witch hat) have changed too, meaning that, no matter how ,much time (years in our times, and in-universe's months/years/weeks/days too) have pased, they would have gotten a new outfit for the day, specially to see how much have passed during that season (regardless if it is spring, summer, autumn or winter. Albeit, i only feel that summer and autumn have passed in the cd dramas, with spring and winter being felt behind?)