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I also have this issue in my game.
My Sim autonomously changed into a costume because a Spooky Party started, but his costume was not recognized as the "wear costume" tradition.
Also, many costumes are not shown in the costume list, e.g. the robot costume. This is very irritating, especially as there is a costume filter option in CAS.
I think, all the CAS costumes should count as costumes in the game (for a Spooky Party and for the "Wear Costume" tradition).
a week ago
Product: The Sims 4
Which language are you playing the game in? English
How often does the bug occur? Every time (100%)
What is your current game version number? 184.108.40.2060
What expansions, game packs, and stuff packs do you have installed? All of them, except Eco Life Style and Star Wars
Steps: How can we find the bug ourselves? Click “Wear a costume” on an active sim, or stand on the Wondrous Wardrobe Platform when you have a Spooky Party or just in general during the Spooktacular Holiday. The only costumes available are from the base game, none from the Spooky Stuff pack. The bug seems to happen primarily when trying to satisfy the holiday “Wear a Costume” tradition, and doesn't 'fix' if you plan a party with your sims during the Holiday. I tried the Spooky Party event in a random day without any holiday and was able to wear costumes from Spooky Stuff.
What happens when the bug occurs? During the Spooktacular day holiday the only costume options are those from the base game, nothing from the Spooky Stuff Pack. Which is really annoying for the kids in particular since you can only select Yoda, or Sausage. (Even the toddlers have slightly better costume options. Wish they had more though)
What do you expect to see? I expect to be able to access the costumes from the Spooky Stuff pack during the Spooktacular Holiday, as well as any of those from Get Famous in the wear a Costume menu.
Have you installed any customization with the game, e.g. Custom Content or Mods? Nope.
Did this issue appear after a specific patch or change you made to your system? I can't remember when it first occurred. But it's been going on for a while.