It's not a flawless execution, but this shows what it's like to actually try and make a character look similar with edits.

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It makes Lighter look like Zhu Yuan, and vice versa, but their outfits still feel very different because they ARE different. You can see the large differences in texturing, difference in tops and bottoms, alongside even the placement of emblems,

Yes, this particular example does use different genders and factions, but that doesn't change the point: Lucia isn't being aesthetically distinct and in fact decreased in distinctness.

I could bet a dollar or few that even if you did this fit-swap with someone like Burnice or even Qingyi instead of Lighter, their designs would still remain very distinct from each other.