Note that the armour known as a Buff Coat is from non-WotC sourcebook: Quintessential Ranger by Mongoose Publishing.
Normal Stats
Light Armour
Cost: 50 gp
Weight: 15 lbs
Max Dex: +6
AC Check Penalty: -2
AC Bonus: +3
Arcane Failure: 20%
Masterwork buff coat: 100 gp (fair quality)
Market price: 200 gp
Description: For troops who hope not to get too close to the enemy and yet to have a little protection against sword-blades, the buff coat can be a good compromise. It is a heavy leather coat covering the torso, hips and upper thighs only, worn with similarly tough boots, long thick leather gauntlets, and an open-faced steel helmet such as a morion or pot helm.