Hi !
I have said it several times, but I will repeat it.
In order for the changes to be reflected in the game, you must always delete your current profile save.
You will then be thrown out of the main menu, then a new team selection, and so on.
(FIFA19 uses autosave function)
You used the original FIFA19 file. I checked and the Liverpool collar was the same as it appeared in your picture. (red)
But what I sent
XBOX_Pool_New DB.zip
Here, on the other hand, the home and guest jerseys will be transparent and only the pants will be visible.

Probably no collargeometry 24, 23 .