There is following sections in book:
Credits & Contents
Introduction
Questing Gear & Basics
Weaponry
Armour
Transport & Buildings
Beasts & Cohorts
The Rare & Wondrous
Reference section
In Questing Gear & Basics section, there is special (and not so special of course) clothings, like Assassin's vest etc.
In Armour section, there is quite a lot additional armour available (like Bone, Enlamelled, Serpentmail, wooden, Gladiator Armour, False Plate etc)
Also, there is section about modifying armours (bladed, camouflaged, muted, reinforced, spiked and wintered).
Also you can find information about Alternate Armour materials, Monster hide armours and Repairing Armour.
The book is really good, I would recommend it to anyone who wish to have more gearing options for adventurers.
EDIT. I am talking about "Arms & Equipment" book. Is this the same you are talking about?