If you use the link below I am sure they will help you obtain (purchase) the correct items and tell you in which position they should be worn.
http://www.sappershop.com/
You may have to go to a surplus store for the Combat Kit as CS95 was not available in the 1980's. It would help if you knew during which time of the year you will be pretending to be in and what time of day, also indoors or outdoors. We have a mulitude of different combinations of uniform.
Marc