Back bling
Back bling that fills the frame
Big shield, tiny socket — it can clip. Pick a size that fits the outfit and you are golden.
Reactive bags
Knockout morphs need a source that speaks that channel. A default flag often will not.
Pets
Animated pets are extra skeletons. They fail after patches more than static shields.
Invisible slot
Empty socket — revert, verify, swap again.
Will it show in replays I record?
On your machine, yes. On Epic’s replay of another player, no.