Some necklaces disappear when the player chooses some female tops. Some tops cause all necklaces to disappear, while others make only one or two necklaces to disappear. All of those tops make the spiked choker to disappear. See which tops in the attached picture.
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My sims 4 studio with poses for download and stuff: click
You may like to post feedback on the issue on this AHQ EA site
http://answers.ea.com/t5/The-Sims-4-Bug-Reports/COLLECTION-THREAD-Issues-with-CAS-Assets/m-p/5068136#M20263
SimQARobo has posted on another AHQ EA thread that http://answers.ea.com/t5/The-Sims-4-Bug-Reports/BY-DESIGN-GTW-No-necklace-with-Blouse-with-roll-up-sleeves/m-p/4461335#M10968
http://forums.thesims.com/en_US/discussion/817478/hello-come-and-introduce-yourself
http://tinyurl.com/OneRoomOneWeek
http://tinyurl.com/rosemow
My Showcase thread https://forums.thesims.com/en_US/discussion/948861/rosemow-s-rooms-showcase
As you can see in the picture some tops leave the neck area and its surroundings completely free, but the necklaces just don't appear.