Clothes for V1 and 2 are interchangeable, i believe. V3 came with a V3-V2 mesh, which gave you V3's head on a V2 body, although it didn't allow for any of V2's body morphs. V4 has done the same, giving you an unmodifiable V3 body mesh with V4's headon the top (which I believe CAN still be morphed).

Hair-wsie, so far as I'm aware, each generation (with the exception of Vs 1&2) has had a different head mesh, so hair and hats will nto fit immediately. With a littel scaling and translation, they may still work, though.

Character morphs and texturing is not cross-compatible fro one generation to the next.

I think that covers all the bases. If I'm wrong on any of these points, I'm sure someone will come along and corect me. :)

jonthecelt