The tattoos in FIFA 16 are in the folder (data/sceneassets/tattoo) with a slighter different file name.
If the FIFA 15 file name was "playerskin_7784_textures" then the FIFA 16 file name would be "tattoo_7784_0" just without the quotations
This is a list I found on the EA Website:
[Argentina] Primera División
•Bahía Blanca
•Banfield
•Fl. Varela
•G. La Plata
•Junín
•Mar del Plata
•Mataderos
•Parque Patricios
•Posadas
•Rafaela
•San Juan
•Santa Fe
•Sarandí
•Temperley
•Unión
[Italy]...