Perhaps the way I have engineered my ''attachment system" will be of some help. (for extremities only-arms,legs). I have considered many different options and various means of 'rigging' and the idea of straps and buckles hanging out all over the place just tweaks my OCD.... So with that said... 1st, I'll start with wearing the full 1pc. body under-suit. 2nd, After you have your armor shells pre-hardened (you can skip the fiberglass process all together as the foam will provide rigidity and strength) I recommend only doing one limb at a time ... Wrap your arm and/or leg with plastic 'cling' wrap, making sure it's as smooth as possible. Then test-fit each armor shell for location and proper fit. (the plastic wrap is to keep your underarmor clean and provide easy lift-off from the foam) Once this is acheived, secure them inplace using elastic band(s) around the exterior (not too tight). Now this is where the 'cling wrap' comes into play... next is to fill the voids inside the armor shell using expanding foam. The excess will plume out around the edges and can be easily trimmed away after taking the core off. The resulting piece can then be sanded and resined over the inside for an extremely strong composite armor core. What you have after finishing is a form-fitting armor core that can easily accept velcro, or any other internal attachment system you desire, due to the smooth internal surface. I suggest 2 inch wide strips as long as possible for maximum retention. The next step is to sew the corrisponding velco strips onto the body suits exterior with a thin foam backer so as to keep them slightly lifted from the body for cooling and a free-floating appearance .. I suggest splitting the arm and leg armor cores into 2 seperate shells and closing the open edges 1st. This will allow for stretching of the body suit, allow ease of movement and minimize any sag from armor cores after they are equipped. The inherant beauty of this design allows for many other types of armor/combos to be easily fitted with one body suit. I will be using other methods to attach the boots, torso and cod piece. DO NOT use this method for your helm. More info on these will be coming shortly... so stay tuned !