Ballistic Weave

The Ballistic weave is an armor mod that allows you to add defensive stats to most clothing items, including outfits, clothing that can be worn under armor, and a small number of Hats. This crafting ability can be learned from Tinker Tom after performing certain quests for the Railroad faction.

Once this skill is learned, you can upgrade any applicable clothing item at an Armor workbench.

Guide

 * 1) Find and begin performing Railroad faction quests until P.A.M. gives a quest to secure a DIA cache.
 * 2) After completing this quest for P.A.M., you can speak to Tinker Tom who will talk about the DIA cache, mentioning Ballistic fiber upgrades and offering some armored gear. At this point the armor mod is unlocked to the player at any Armor workbench.

Upgradable clothing
(this is an incomplete list)
 * Agatha's dress
 * Army fatigues
 * Atom Cats jacket and jeans
 * Baseball uniform
 * Bathrobe
 * Black vest and slacks
 * Casual outfit
 * Checkered Shirt and Slacks
 * Child of Atom long rags
 * Clean blue suit
 * Clean grey suit
 * Clean striped suit
 * Clean tan suit
 * Courser uniform
 * Dirty army fatigues
 * Dirty black suit
 * Dirty blue suit
 * Dirty gray suit
 * Dirty Postman Uniform
 * Dirty tan suit
 * Dirty striped suit
 * Dirty trench Coat
 * Faded trench coat
 * Farmhand clothes
 * Father's Lab Coat
 * Fatigues
 * Feathered Dress
 * Greaser jacket & jeans
 * Green shirt and combat boots
 * Hooded rags
 * Lab coat (Fallout 4)
 * Laundered blue dress
 * Laundered denim dress
 * Laundered green dress
 * Laundered loungewear
 * Laundered pink dress
 * Laundered rose dress
 * Longshoreman outfit
 * Lorenzo's Suit
 * MacCready's Duster
 * Maxson's battlecoat
 * Mechanic jumpsuit
 * Military fatigues
 * Minuteman outfit
 * Pastor's vestments
 * Patched three-piece suit
 * Postman uniform
 * Ratty skirt
 * Red dress
 * Red Frock Coat
 * Reginald's suit
 * Rex's Suit
 * Sequin dress
 * Submariner uniform
 * Summer shorts
 * Surveyor outfit
 * Suspenders and slacks
 * Sweater vest and slacks
 * T-shirt and slacks
 * Tattered rags
 * Tuxedo
 * Utility Coveralls
 * Yellow trench coat

Upgradable hats
(this is an incomplete list)
 * Battered fedora
 * Green rag hat
 * Mining helmet
 * Newsboy cap
 * Trilby hat

Non-Upgradable hats
(this is an incomplete list)
 * Formal hat
 * Military Cap