While trying out the latest Preview, I noticed that the trims worked almost perfectly.
Indeed, if you trim in the first slot of your inventory bar a piece of armor (any one) and you equip it by right-clicking, the Trim texture remains displayed for all non-trim armors placed in the inventory bar in question (where you trimmed your piece of armor) until the world relaunch.
Linked issues
is duplicated by 15
10 more links
Affects 1.19.80.24