I am not a seamstress by any means. I am very lucky to have a very reasonable seamstress who lives up the street and I bring her my handiwork to stitch on my wares.
That being said... if you're a novice with sewing like I am, all I did was lay my jumpsuit out on the floor, flat. I used WRAPPING PAPER (because it comes in big sheets that you can unroll) to just kind of "trace" where the seams were on the suit. I basically did my best to just mirror the pattern that someone so kindly put in the link in an above post.
To do the other leg, I used the same pattern, just "flipped" over to make the mirror image.