Sally Jupiter Costume (Silk Spectre I) from Watchmen

Step 3 Patternmaking.

This step is fairly tedious, and I suggest pinning your pattern pieces together when they're cut out and trying them on (Watch for pins!!) to make sure you're close to the correct size, keeping in mind your seam allowance requirements.  This is also a good check for the angle required on your belt.  My first time through, I discovered the belt would come down into a V shape in the back if I only did it in three sections, so I redesigned the belt with 5 sections, and the back two at an upward angle.

Since no patterns exist for this costume, I made my own, using a section of a large roll of brown paper I have.  
Looking at the character from the film version (great improvement upon the comic, as far as this costume is concerned, in my opinion).  I decided upon basic measurements for my pattern, and drew an enlarged version of my design on the brown paper. 
Then I drew a line 1/2" around each, to provide a seam allowance when I cut the fabric. Next, I cut the brown paper on the lines I drew to make a pattern pieces.