You definitely cannot fit your passport in a Pochette Cles. It does hold coins, keys, notes (though they must be folded) and standard credit-card sized cards.
i remember aaaaages ago i spotted a huge groom cles at a street market and thought "damn if only LV did actually make it that size! that would be so much handier!"
You can actually get a passport ID card now. However, your passport ID card can only be used in places like Canada, Caribbean and perhaps Mexico. If you go overseas, you have to use the traditional passport book.