Izzy is the slimline wallet you were waiting for.  Packed with 12 cardslots, 3 full width slip pockets and a zippered coinpocket. Big enough for a phone with case.
And the most important thing? You only need 3 fat quarters of Quilting Cotton, minimal interfacing and just 1 magnetic snap.

Due to the method of constructing this wallet, anything thicker than quilting weight is not suitable as material. Cork and pleather will not turn out great.
You insist on making a wallet in Cork or pleather? Try the Rozy and Roxy wallet!

Kits to make this wallet are available in the store.