Breast wallet (also called a "secretary wallet" or "passage wallet") are wallets in Mens Wallets which the bills are not folded. They are intended for men's breast pocket in a jacket, or for a handbag. They are too large for storage in a pant pocket.
Some wallets, particularly in Europe (where less than denominated coins are added prevalent) contain a coin purse compartment. Some wallets have built-in clasps or bands to keep them closed. As European bills (pounds, euros) are larger than American bills in one dimension, they don't fit in some smaller American wallets.