To make the scabbard pattern, take the knife and place it on a flat surface. Put plastic wrap around the entirety of the knife or a wooden knife replica, then strip the masking tape across the knife, covering the plastic.
Take a pen or marker and draw a seam onto the tape, drawing a line vertically down the center of the back. Cut the plastic and tape off of the knife along the seam line.
Transfer the pattern measurements to card stock to make the template for the final pattern.
Take the 5/6 oz. of vegetable tanned cowhide and lightly wet the leather with water.
Using the card stock as a template, take the straight-edge tracer and scribe the pattern onto the front (the smooth grain side), of the leather while the leather is still damp.
Put the card stock pattern onto the cutting board and use the half-moon knife or heavy duty knife to cut out the leather pattern along the pattern line.
Decorate the leather by soaking it in a bowl of water. After the leather has soaked up the water, let the leather dry out until it is damp.
Place the leather on a marble slab or other hard surface. Using the tracer, trace the division line between the blade and handle sections.
Take the fleur-de-lis stamp and press it into the top side of the leather scabbard. Use the tracer to make diamonds around the fleur-de-lis. Then use the overstitch wheel to create the dots in the background at 5 stitches per inch.
Create an iron oxide mixture by combining 2 cups of water and vinegar with scraps of iron, such as old nails or steel wool, to dye the leather. This takes about two weeks to mix properly, so make sure to create the iron oxide two weeks in advance. The liquid is done when it takes on an orangey-red color and has a foam film on the top.
Put on latex or rubber gloves. Soak up the iron oxide mixture with sheep wool or cloth. Take the sheep wool or cloth covered in the dye and apply to both sides of the leather. Apply two coats.
Lightly wet the leather again until damp. Match up the leather seams and mold the leather around the knife. The leather will retain the shape of the knife when completely dry.
Line up the edges of the pieces of leather at the seams while damp. Take the wing dividers and measure the seam line at 1/16 inch from the seam. Mark the seam line.
Take the overstitch wheel and make stitch marks around the length of the edges. Mark each seam side so all holes line up with each other.
Take 2 ply of waxed linen or nylon thread and coat with beeswax, which will help the stitches grip the leather.
Wet the leather lightly. Use the stitching awl and punch holes through the grain along the edge. Make holes about 1/2 inch apart. Line up the holes so that they match up on both sides of the seams.
Cut a length of thread that is 3 times the length of the seam. Thread each end of the harness needle with the waxed thread. Put the needle and thread through the point, or tip, of the scabbard first. Pull the thread halfway through, then stitch up the scabbard, pulling the thread taut without making rips in the leather. Put the needle and thread through each hole of the leather twice. Once back at the top, backstitch once and tie the thread off with a square knot. Clip the ends off close to the edge of the leather.
Apply a thin coat of neatsfoot oil to the scabbard to darken the leather's color.
Cut hanging slits at the back part of the scabbard's handle using the half-moon knife. The slits will create an angle on which the scabbard will hang from a wearer's belt.