sims 3 mermaid scale legs for sims 4

i feel like i might have posted this before but im not sure, or even where i might have done so but anyways. Can anyone convert the sims 3 mermaid legs to sims 4 as a tattoo, skin tone or skin details, or even socks? i know the colors wouldn't be customization like in sims 3 but i think it may be easier to recollor them with sims 4 studio than to convert them. i would try to do it myself but i havent been able to locate the texture. id like to just try and find the texture file for the skintone and twist it and put it on a sims 4 texture thing or whatever (sorry, i know im not making much sense but i cant find the right words right now)  in sims 4 studio but again, i cant find the file. , make is into a skintone or somthing, recreate it, or even just point me in the right direction to finding the file in the first place id very much appreciate it.