As you may have noticed, patch 3.1.2 brought an Equipment manager.
However, it offers just very basic features. You can only create full sets. So for example you cannot set a resistance set which contains 5 parts (if you try to unequip everything else except the resistance parts and save afterwards, the itemslots which didn't have something in it will be unequipped again when restoring such a set)
I just found out a way to save partial sets and will describe the procedure in an example since it's the easiest way to understand.
- first of all, save your normal set without the resistance equipment
- now unequip everything and equip your resistance parts
- for every itemslot which is empty, buy some green junk or buy some items via emblems of heroism etc. and equip them
- save as a new set
- You should now have two sets, one with the normal equip and one with the resistance equipment and the junk items
- now, delete/disenchant the greens or let the vendor refund you the emblems which were used to buy items.
- voilà, you have achieved the desired effect
- to test, simply equip the normal set which should replace all items.
- now choose the resistance set. only the resistance parts should be changed / rest should stay at the old set
so, even if it's a bit of work to add partial sets, you benefit from server-side storage of your sets and can kick away one addon more, if you don't need the advanced automatic set-equip-features from addons like outfitter.
hope that it helps someone of who and that it's not a repost. I searched for equipment manager but didn't found anything comparable.