Customization information:

1. Exterior - refers to the outside of the wallet. 

2. Interior - Main Panel - refers to the leather panel behind the 4 pockets on the interior of the wallet

3. Back 2 pockets - this refers to the 2 rear pockets on either side of the interior 

4. Front 2 pockets - the 2 pockets that are most visible on either side of the interior 

For thread color reference: