I recall we had this discussion in the past, but some figures are better to stay in the "charming" category rather than going right into castoff territory. In this case, having her wearing so many layers over a skimpy swimsuit tells an interesting story of refrained boldness that could be lost if more was seen. I that regards, it makes the imagination work much more, which isn't always a bad thing.
As for sailor fuku, I agree, it's the first and mandatory step in moe territory. I'll show my age, but when I started watching animes (and that meant Sailor Moon back then), the sailor uniform rang a bell for me. Never get tired of this classic. I guess I inherited that interest from my mother who, in late summer 1987, decided it was a good idea to make three matching sailor uniforms for my brother, my sister and I to attend my oldest cousin's marriage. As expected, my avatar figure is indeed a glimpse from that day.
BTW, under your influence, I've been working on a 3D printed garage kit sculpted by an Italian fan and which I modified to be closer to the original character design. It should be ready in a few days for a photoshoot and I hope to write an article next week. One thing is sure, it's a blast from the past paying homage to a famous bishoujo.Another interesting review for a lesser known figure. UC has always been a mixed bag. When they hit the target, they do it with style, but when they miss, it's always a little bit. As much a I like many of their figures, I've learned to wait to see the actual products before committing to buy. That said, it's encouraging seeing them up their game... though that cheap transparent base! If at least it was a clear acrylic one instead of a cheap hazy one straight from the late 2000s. ;-)
I think this figure is better for not having a castoff option. Every part of Rika's outfit (the short seifuku top and the skimpy bloomers) screams "just a little bit" and having a castoff option would defeat that. Plus, while Coffee Kizoku does do fully 18+ artworks now and then, generally most of Coffee's content falls in that slightly ecchi, but not full-on 18+ category.
The base is disappointing, but it seems like a lot of these mid-tier companies (Union Creative, Daiki) tend to go that route.
I'm interested to see what classic character this custom GK will be. Based on this discussion, I have a pretty good idea, but we shall see if my guess is correct :).