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Strange Sith 1/5-5/5 and Strange Jedi 1/5-5/5. Mass killing Force Sensitive Types on Dantooine (anything with Dark in the name seems to have a better drop rate) or Nightsisters on Dathomir.
Once you get one in your inventory, radial menu it and select "Add to Collections" (you'll know that you don't have it if the name is in green).
There are also items you can buy from the Aurillian Village using Tokens that you have gotten from beating the Heroic Encounters (you'll need you'll need 18 tokens for each in order to get the 3 pieces from the village and then you combine that with your waistpack which will give you 4 items.)
The 3 items from the Village will activate a 3-piece stat while the waistpack is a part of a five piece stat.
I'm not too sure on the specifics for the Jedi stuff, but this is pretty much a basic explanation of what you need to do to start.
The waistpack has nothing to do with the village .. and does not stack to give you a 3rd or 4th etc ... thats only heroic's Jewlery sets ... they are completly different.
I have an elder Jedi and can use this waistpack since its the 2nd part of the elder robe ... but its not viable for PvP , ... the stats suck bad compared to a modded 2499 energy resist PSG full of 35's including Block value ... anyway the Waist pack is Tradable so I sold mine for 250 mill.
on a side note Sith 4/5 Wait pack drop is exceptionally low the chance of looting it yourself has droped to some insane one in a million so since not many people can use this waistpack they often sell there 4/5 ... so have some credits ready if your serious about completing this collection ... the 4/5 is selling on my server in the last week for about 150 mill
good luck to you