*template*

1. Picking pockets (or folds of a garment or a girdle) also
        includes such activities as pilfering and filching small items. It
        is done by light touch && sleight of hand.
 

Picking Pockets fails if a score above the percentage shown for the level of thief attempting the function is generated.

If the score is 21% or more above the #number# shown, the victim notices the thief's attempt.
The potential victim reduces the thief's chances for success by 5% for every level of experience he or she is above the 3rd, i.e. -5% ot 4th level, etc.
    For example, a high level thief (Master Thief, 12th level) is planning to pick
    the pockets of a M-U he has noticed nearby. The base chance for
    success is 100%, the thief is a half-elf and adds 10% for racial ability; the
    thief also has 18 dexterity ability score, so another 10% is added. This totols
    a nice, safe 120% - can't fail! However, the victim happens to be 12th
    level also, so the subtraction is 9 X -5% = -45%. This brings the chance for
    success down to 75%. A good chance, but if 96% or higher is rolled, the
    thief will be noticed, and . . .
Success gains an item from the victim;
the item is determined at random from a list of possessions unless the exact location of a particular item is known by the thief.


DMG:

Picking Pockets:

Failure allows additional attempts.
The victim might notice
    and allow the thief to opercte anyway in order to track him || her back to the place he or she uses as a HQ.
Up to two attempts at picking a pocket can be made during a round.

Q: In the OA book, both 
Table 23 and the description of the 
yakuza character class state that the ninja 
has the thief ability to pick pockets. Why 
are the percentages for this ability not 
given on Table 24 with the other thieving 
abilities? Since all the percentages for the 
other thieving abilities which apply for 
the monk, ninja, and yakuza character 
classes were altered slightly, I am not sure 
whether I can use the PH 
figures without risking imbalance. 
A: Use the "pick pockets" percentages 
given in the PH.
(Polyhedron #32)