Using a human figure base mesh and building the suit around the body. Keeping in mind the proportions and how the body would move inside the suit. while creating this suit I was also thinking how to keep it a more realistic style yet modern. 
The back pack was designed after a hiking pack, compact yet easily accessible. 
This model was designed for use in the Unity game Engine. 5800 tris. 

Created this model using Zbrush, Maya, Photoshop, and 3D coat. 
sculpted the High resolution model with detail of the fabric and metal surfaces in the helmet. Then a low poly model was created in 3Dcoat. The high resolution model was projected onto the low poly model to get different texture maps: ambient occlusion, cavity, convexity, and normals.