A pickpocket generally avoids front trouser pockets, and especially buttoned or zippered pockets. If you have to carry your wallet in an unbuttoned jacket, coat or pants pocket, be sure it holds only what you can afford to lose.
How do you hide your stuff from pickpockets?
Pants with zippered pockets inside of pockets, bras with stash pockets for credit cards, and jackets with inside pockets are all great places to keep cash. Here's a link to Amazon's many pickpocket proof items. Use a money belt or neck stash. I use these sometimes but certainly not always.