Custom CAS mesh: Possible to use different texture set ?

I've done some experimenting with separate textures - setting a bracelet and a dress to use texture type 0x00B2D882, which is DDS DST1 compression and changing a backpack to an accessory. In all cases the final composited texture was messed up and most or all of the sim was showing the skin texture. Maybe there's some setting that can correct this, I don't know. Btw the backpack speculars also seem to be DDS DST.