Cut your leather, felt and tear-away stabilizer into 20cm (8in) squares. Cut two of leather, two of felt and one of tear-away stabilizer. You might find it easier to cut your leather using a leather or craft knife and cutting mat.
With a pencil, sketch a rectangle (according to the dimensions calculated in step 1) onto the tear-away stabilizer. Add a simple line drawing of your desired motif into the rectangle, positioned just where you want it.
Using a sharp large-eye needle and coloured embroidery thread, stitch over the outline of your drawing using a decorative running stich. Alternatively, stitch over your drawing outline using your desired decorative stitch on your sewing machine fitted with a leather needle.
Place your pouch onto the cutting mat. With a leather knife or craft scalpel, trim the pouch along the edge of a metal ruler leaving 2mm (1/8in) at the bottom and on each side and 1cm (3/8in) at the top. Make sure not to cut through the stitches holding the pouch together.