My Documentation about GTA Vs cloth alternations and 1st pers alternates.
If you have a clothing with a first person model. (ussually _1 is used for a first person model)
Example:
Used to fix components that block your sight in first person.
If you want some clothes to have an alternative model. ( _number after the name of drawable) You can set what alternation gets set when a specific component is set.
Example:
You created a mask that clips through hoodies with a hood thats up. Now you can create a different model which fits in the hood and configure if you combine those clothes the alternative model, which doesn't clip throu, will be shown.
If you want specific first person filters set when you wear a choosen component.
Example:
You added new glasses, but unlike original glasses, you dont get those colorspecific filter. With this file you can set those filters and more.