Read people asking about .dat sites since FFXIdats closed down:
Neko Sentai has an extensive collection, downside is you have to sift through a bunch of 18+ mods.
also: The Goblin Tailor -
http://thegoblintailor.forumotion.ca/ -- This site was made by a couple of the guys from FFXIdats who were trying to save the works there and rehost them.
FFximc --
www.ffximc.com has some dats too from what I recall. Aaaaand that's about all I remember from off the top of my head.
Also @ Eirwen: Cute .dats in the pic, but the corsage looks like it has an alpha map error (which is causing the black block bits), if you'd like it fixed, please send me a copy of the .dat and I'll sort it out for you~
Have a good day guys, back to WHMing in dyna x_x