The Thief
 
- - - - -
- - - - Unearthed Arcana

As shown on Character Classes Table II, members of the thief class
are not restricted to wearing only leather armor. However, a thief’s
chance of performing one of the special functions of the class may be
lessened if he or she is otherwise attired - and certain bonuses apply
if the thief wears no armor, as indicated on the following table.

THIEVES TABLE III

    Effects of Armor on Thief Functions
 
Thief Function No armor1 Elfin Chain (SA) Studded or 
Padded
Ring or 
Chain
Scale or 
Banded
Plate Mail Plate Armor
Pick Pockets +5 -20 -30 -40 -50 -75 -100
Open Locks - -5 -10 -15 -20 -40 -80
Find/Remove Traps - -5 -10 -15 -20 -40 -80
Move Silently +10 -10 -20 -40 -60 -80 -100
Hide in Shadows2 +5 -10 -20 -30 -50 -75 -110
Hear Noise - -5 -10 -20 -30 -50 -70
Climb Walls +10 -20 -30 -40 -90 -99 -99.9%

        General note: No dexterity bonuses apply to thief functions (though penalties do) when wearing armor other than simple leather.
        1: This category applies when wearing bracers of defense and/or a cloak, but no large protective devices.
        2: Assumes that armor worn is covered by another garment. Elfin chain mail is light and thin, and can be worn under normal clothing. All
            other types of armor except simple leather are stiff and/or bulky, and can only be covered by a full body cloak.
            <note: this contradicts what is written in "Dressing for the Weather", in the WSG>