Unlocks are per household.
If you are looking to unlock outfits for specific households there is a workaround using cheats. Let's say I wanted to make A household where the father wears the detective outfit, the mother wears the artist outfit the grandmother wears the astronaut outfit etc.
i would first create a different household of 2 random sims. Nothing about them matters, name them A&B. Place them in the world, then I would use the career progress cheats (can be found here: https://www.carls-sims-4-guide.com/cheats.php ) to get them to the top of EVERY career. Sim A would be the top branch of each career & Sim B the bottom branch. Save them to your library for future use, they've unlocked every career item/outfit between them.
Next: create the family you actually want to play with, or select a family from the world. Using the manage household button from manage worlds, merge Sim A&B into the desired household. Take them into CAS. Career unlock outfits should be available for your desired sims! Now move Sim A&B out - the unlocks will stay. Do this as many times as you like.
