Tucked buttoned shirts become 'untucked' when adding layer details

I noticed that when putting accessories (ex: necklaces, tights, socks) it would untuck the shirts that are tucked into pants and skirts. Not just pack clothing items, base game items as well.

I do not have CC or mods

Had this issue with a Sim who had body hair, tattoos, skin details and scars. After becoming a Werewolf, I decided to add one more scar, but it was one too many — not only his buttoned shirts got untucked, but I think some other Sims’ as well! (Or maybe it was a recency bias on my part?)

After removing one skin detail the issue disappeared on my Werewolf. 

Given the new tattoo system in Hobbies & Businesses seems to use more layering, this issue could become really prevalent in the coming weeks. 

I have the same problem and it’s very annoying. 

I was creating a Sim and I noticed some clothes and accessories are incompatible together. For example I was trying to wear my Sim with jungle adventure pants and romantic garden shirt but when I put the new casanova cave kit chain the shirt bugged out of the pants. 

I don't work for EA so unfortunately I don't have that kind of info. Since there aren't that many me toos on the original AHQ thread (linked in your post), I would post there as well and make sure to me too.

Thanks for your reply ! It's nice to know why this is happening.
Do you know if this issue is planned to be corrected ?

Yes, this is a known issue that happens with too many skin details.