These won't work in multiplayer unless the module intentionally has them added. Also, a large chunk of them don't work properly with cloaks and another host of small issues. It's a great override, just hasn't been updated in years and years.
So wasn't the game, after all
. In effect, with CEP we already have a large chunk of content which does not work well (e.g. clothing/armour models for large phenotype characters), but that is not a showstopper. The peculiarity here, anyway, is that this ACP thing is still an override, thus some people might choose to stay off it and see no effects, positive or negative whatsoever.
The actual bugs of ACP I am aware so far are the 1) The last worn cloak always reappears when changing anything else, like armour, even if it's not equipped 2) Some robes (e.g. the coats of 1.69) are not compatible.