When I get raided, I would love my colonists to grab certain items (i.e. armor). Is there a mod that enables a functionality to run and gather a stack or something before fighting?
This would also work greatly for winter season etc.
In Vanilla, afaik the only way is to have different outfit setup. Game comes with three "worker, soldier, nudist" you can edit then to pick up exactly what you want them to pick up and creat more. Ie, I change my soldiers to rangers and only give them armor vest power and armor helmet and make another "heavy melee" outfit firepower armor and shield belt.
When I play extreme cold (-100C) I also have a "winter worker" and "winter soldier" setup
Change the outfit selection and they will go grab all their need immediately
Maybe Change Dresser is what you are looking for
https://ludeon.com/forums/index.php?topic=35632.0