[edit]
the current AE release contains 2 disguises (du_xxxx_yyyy002 & co_xxxx_yyyy004) and 3 (civilian or school) costumes (du_xxxx_yyyy001, co_xxxx_yyyy003 & co_xxxx_yyyy005).
only the .3DC files for the co_xxxx_yyyy004 & co_xxxx_yyyy005 sets use a new file format.
[/edit]
here are these files converted from episo 6 format to former 4.x format.
these .3DC files have to be added in your character definitions.
the .DDS files will be found in the US client (DDS files are flat and doesn't depend on the game release).
(the .ani files doesn't depend on .3dc files and so there are no new .ani files)
you have to update your models lists (unless you use those of AE w/o change):
(list of models edited with shStudio 0.7.1)
and you'll be able to use costumes with episo 5.x client.
Edit (March 9th)
Add converted .3DC files for new helmets / hats (.dds also included).
And for the Xmas 2012 Mountain Goat.
.