People have been concerned about RFID chips for many years now, and not just in the context of credit cards. All U.S. passports issued starting in 2006 have these chips that track your photo and information. Metro cards have RFID chips for quick swiping.
In theory, somebody could scan you through your pocket. And yes, people in the real world have been scanned like this. But fortunately, radio waves are relatively easy to interrupt and block, for example by using metallic material.
In high-end travel bags, we apply metallic fabric to make these pockets for ID cards, wallet, and passport. So our bags are anti theft and RFID blocking/protection.