I'm excited for the male cast tbh. They described it in a really sweet way about it being a labor of love for the friendships that school kids in Japan have as they grow older (often being a group of boys/girls separately when hanging out, as is the case in youth in many cultures before leaving hometowns). It's not like its far-fetched that they want to explore that dynamic and they have said there are females with large pivotal roles simply outside the permanent party/road trip dynamic.
It looks like it could be a nostalgia heaven and I don't have any issue with their uniforms and clothes being black in their city's culture, and they aren't the same outfits for a reason. Why not, it looks visually interesting for a change in FF. For one game, I don't think the cast being similar stylistically is wrong. If anything that seems to be how lots of friend groups were back in growing up. Tables of guys and tables of girls, often alike and friends for a while. And in Japan, often in uniforms.
EDIT: I didn't play Duscae but this lighting is exciting. sounds like Luminous is a beast, making it both hard to deal with but incredibly strong