Max’s trousers in Fury Road are based on Max’s trousers as seen in Beyond Thunderdome.
There are 2 pockets on the trousers.
To replicate the flap and stitching, you will need some black garment leather, waxed thread, and a sewing awl. You can also use an awl in combination with a thick sewing needle. Note: the typical sewing technique has you thread the needle and tie the ends of the thread, resulting in stitches twice the thickness of the thread.