A great way to make a pattern for a costume that fits your body is the duct-tape method.
You need a friend to help you, a roll of duct tape, a permanent marker, and an old T-shirt you're willing to sacrifice.
Put on the T-shirt, and have your friend slowly cover the shirt with duct tape. Use 4-6" strips and make sure that you're covered.
Then go stand in front of a mirror. Think about where you want seams, necklines, etc to be. Draw the lines on the duct tape with the marker. Then have your friend CAREFULLY cut along one of the seam lines so that you can take the garment off. Cut along all the seamlines, and squash the pieces flat.
If you're working in hard leather and you only want to lace the pieces together, then use this as your pattern. If you want to actually sew seams in the material or leather you are using, you will need to add seam allowances to your taped pattern pieces before cutting them out of your final material.
I'm a costumer who works Ren Faires and SF conventions - I was a Masquerade judge Windycon this weekend. I'd be happy to give you more specific advice if you'll tell me a little more about what costume/character you are doing.
------------------------------------------------------ Wendy Z Chicago, IL (Moo) Wench Wear Costumes
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"Though she be but little, she is fierce""It's the little ones you have to watch out for...""I'm not short - I'm concentrated"--------------------------------------------------------