As I left this till the last second it caused a lot of stress, and my wallet wasnt very happy with me, but I hope you all appreciate it :D
Step 1: Drafting the pattern
You may find that this is expensive, so, you should do what I did, make one by wrapping duct tape around your body sticky side up once, add 2 more layers sticky side down, then fill it with expanding foam once your done. Only fill it bit by bit with the foam otherwise it well not set :D
To make your pattern, all thats done is a sheet of material is placed over the front and back quarters of the mannequin, from there you simply fold and trim the material back until it lines up where you want your seam allowances to meet.
A very important detail to make before removing your pattern is to add names/numbers and reference lines, this allows you to remember where and how panels go together, trust me, its very useful :D