Dear Cindy,
Designers do this all the time. They make a toile, or muslin of the design. When it looks the way they want, they mark all the seams with a marker, take it apart, and the patternmaker makes a permanent pattern of the right side of the garment for a woman, a left side for a man.
You don't even have to take the garment apart. You can pin draft. A carpeted floor will work for this if you don't have a professional drafting table. Put a large piece of paper down on the carpet. Smooth out the garment so that the piece you're going to draft is completely flat, with no wrinkles. Then, Secure it with sticky tape so it won't move around. Then, take a pin, and prick the seam every half inch all the way around the piece. When you've completed one piece, repeat the process with the other pieces. For pants, you'll have a front and back, and maybe a pocket.
Remove the garment from the paper, and connect the pin pricks. Then add 5/8-inch seam allowances on all edges, and at least 1-1/2 inches for the hem.
Even though the pants fit, you should make a muslin first out of cheap material to make sure of the fit.
Good luck.
Teri