I agree with eveything T-Bob says, except the wax. Remember that since leather is much thicker than metal it would be wise to use wider lamellae with less total overlap than is typical for metal lamellae. My current project uses roughly 2.5x3.5 inch pieces. I advise you to select a lamellae design, cut and punch holes in your lamellae, and then harden them with the following process:
1. Make a batch of rabbit glue using roughly 1 tsp. rabbit glue powder in 1 cup of water, let it sit overnight to dissolve into a gel, and then place your bowl in a larger bowl of hot tap water to warm and liquify it. If you are doing the entire suit at once you may want a double batch of glue.
2. Thoroughly wet the leather and give each piece a slight vertical curve.
3. Bake the pieces in an oven at 180-200 degrees until hot but still wet. Use an oven thermometer because many ovens are innacurate at low temperatures.
4. Remove leather from oven, adjust leather shape by hand if needed, then paint liberally with rabbit glue until it runs off. Return to oven for 10-15 minutes. Repeat 2 or 3 more times until the leather retains a very glossy appearance after baking. If the glue begins to gel in your bowl then replace the hot water.
5.Bake an additional 30 minutes or until completely dry. Allow the pieces to cool completely before lacing them together as the glue will be slightly tacky.
The resulting pieces will be quite hard yet resilient rather than brittle, water repellant, and weigh about the same as the original leather. The technique is based on 13th century techniques documented
here.
You can get rabbit glue at a large art supply store or order online
here.