Money Belts

Money belts are belts with secret compartments often worn by tourists. One form of money belt is a belt with a pouch attached to the front which is worn under a shirt to protect valuables from thieves and/or pickpockets.

Another form appears to be an ordinary belt when worn, but contains one or more hidden pockets on the inside, typically closed with a zipper. Money belts are often worn by tourists as a precaution against theft.

Items typically placed in a money belt generally include such things as a passport, travel tickets, driver's license, credit cards, cash, and jewellery. A significant problem is that scammers, pickpockets, beggars, and the like, know that the presence of a money belt brings a high likelihood of the bearer being a tourist, and therefore a high-value target, bringing more attention upon the wearer than desirable.

References:
-https://en.wikipedia.org/wiki/Money_belt