Well the under armour is pretty simple I went to JoAnns fabric store and found a couple of yards of black headliner material its kinda like fleece but it has a foam backing, and some cotton broadcloth wich is a thin cotton material. Then I laid out the lines or sections I wanted the undersuit to follow I use a chalk pencil for so I can see the lines. I then pinned the cotton material to the backside to cover the foam and started sewing along the lines to give the apperance of seams or sections. After you get a section finished in this case the abdomen you can tailor it to your body and add a zipper this is just a test section so it is only from the chest down to the waist but I will be adding arms and half legs to it in the future.
I think I will try and Vid a tutorial today for this.
Cheers!