For layering clothes smoothing is very useful - set each item to collide with the item below.

GenX will transfer over the Aged set of morphs from Gen 4 and the texture works great on Genesis, as FSMCdesigns has said Phoenix1966 has some great older characters.

 

Clothes loose their morphs when autofitted to Genesis in DS4 this hsas been updated in DS4.5. Or you can use the transfer utility instead of Autofit.