Non destructive attachment grouping that would serve to link multiple items into a single (container) object to save on attachment points. As many i often run into the hard 38 attachment limit, not so much due to my HUDS or because of heavy, complex attachments but because a LOT of products are no-mod these days and cannot be linked together to save on attachment slots, this adds up quickly when trying to put together an outfit where you need to wear HUD's or items that often need to be worn altogether to work to their full effect such as with heads and bodies where you need the Head / Ears / Eyes / Gums, Bodies / Hands / Feet parts. This is especially problematic with some of the newer modular head body part kits i've seen recently.
This solution could allow end users to link multiple items into a (grouping object) to fully realize their creative vision without compromising the content creator's personal choice of product permissions.
A simple analogy of this would be "outfit folders" but as a new object type, similar to the way PBR material container objects work.