Some things you can do to make it harder to pick your pocket:

1.  If you carry your wallet in a pocket, try putting a rubber band around your wallet; the band’s friction against the fabric of your clothes can act as an alarm.

2.  Informally, if you use a wallet chain, fasten it to your belt or another item of clothing or a purse.

3.  Don’t put your wallet on top of your purse or pack–bury it deep so they have to reach in for it.