WIP i have to fix a bit but I did a simple mesh mod that gives Kasumi Mai's DOA5LR ponytail, I just recolored the base ponytail to Kasumi's natural color(Might tweak it to be a tad darker) and recolored the hair tie to be yellow:
Also I looked at the model of Mai's LR ponytail, it's longer and straighter than her DOA6 version ponytail. I think they nerfed it slightly so that way it wouldn't as awkward in her idle stance since she's bent over alot, plus I think they made it slightly less straight so that way it looked more like her current ponytail in KOFXV