Women like wallets too - not all of us like purses! Wallets come in every shape, color, and material and size.
Odd sizes can make the wallet really awesome. The standard size of 4 x 3 is not always the best.
The larger sizes can accommodate more stuffs, but really it all depends on your life style.
Special features like snaps, buttons, straps, Velcro, and zippers add an interesting closure option to an otherwise boring wallet.