This pages covers sewing techniques used in shoemaking, upholstery work, sailmaking, leatherworking, canvas, and similar work.

needles and thread

tools used for hand-sewing

sewing machines

Yup, there are sewing machines made for shoemakers and saddlemakers. They're quite expensive though, so I haven't looked into them much.

load-bearing stitches

Everyone says you shouldn't sew your own climbing slings. Really, you shouldn't. But, if you're willing to put your life in your own hands, here is some possible advice:

where to buy

McMaster Carr:

Sailrite:

other stuff

pictures to inspire you: