You cannot stack more than two coins/pouches. Note: The costumes do not work with this trick, as it is saved to your system save data file. Repeat this process as many times as desired. Locate the saved game data folder for Resident Evil 3, and overwrite the 'system saved data' file with the file you previously saved. Go to the saved game data folder for Resident Evil 3 again.
The item will appear in your storage box. Start the game, then go to 'Bonuses', 'Shop', and buy any item(s) from the store that you can afford. Locate the saved game data folder for Resident Evil 3, and create a copy of the 'system saved data' file.