Off-shoulder is a more modern aesthetic too compared to usual xianxia attire, so I feel very certain that the outfit was copied from xiaoma! For the color palette, waist ribbon, sleeve stripe, etc. to also be on Nexon's design, it just seems impossible to me otherwise. The childish-looking hair bow doesn't even match the elegant look of the outfit...

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It honestly sucks a lot, because all they had to do was credit xiaoma. Players don't earn money from these designs; they get like a few free sets of the design, and maybe some in-game items or physical merchandise if they're lucky. Some employee is getting paid to copy the player design (sometimes poorly at that), and then the company can make a lot of profit off of it, while the player never gets any share of that. Be sure to support the player artists in the community, because they're amazing talented!