I think for wallet, it's all about personal preference.

Some major consideration include whether you need coin pouch or not (zipper), how many card slots required, long wallet or short wallet, slim or bulky.

There is also trend of using chain wallet which can also be used like small sling bag especially now that we're using mobile for many e-payments these days, our wallets are getting slimmer in size.

If your gf cares about the brand, then I would say the choice then depends on your budget. Charles & Keith is a good start, Bonia is a local brand with reasonable pricing that looks good, following would be Kate Spade and then luxury brands.

These days brands don't specialise in one type of wallet. But if your gf is someone who doesn't care about brand but functionality, you can checkout Bellroy which seems to be designed for minimalist.