Is there any way to unlock ALL the hair and clothing in the game for ALL classes? (including NPC)

not for ALL hair and clothing. im looking for one too.

If there are a handful of specific outfits you like, I used the disableclothingfilter cheat & I also used some of Shimrod's mods where it adds certain clothing such as the rogue's outfits, etc. Otherwise, I don't think there is since I've been looking for one for a few days now. More so an unlocker to unlock all the clothes, furniture, etc. from achievements.

neither of 'em unlock everything.

So many unlocker mods, and we still don't have it all! My work around is to make the NPC a hero (any kind), plan their outfit, then set profession to "none" using dynamic professions mod, or with just grims core using "retire from profession". Usually this works well, the sim will have both the previous and the new one available at the dresser. Be careful, sometimes the sim is unable to retire, and setting profession to none also does nothing, making you stuck with a new hero! Always save before trying this method; it works great but for those few sims that are "unretireable"! Hopefully someone will come up with a better fix for this!

I know they don't unlock everything. That's why I was suggesting certain clothing items you may want to use and they do unlock most of it if you do it that way.

idk by ''everything'' I understand every item of clothing and head gear the game contains, not just the normal clothes.