Shoulders-shoulder bells have a small strap that goes from the bells up to ABS shoulder straps. The strap has snapps at both ends to connect them to each other.
Biceps- The bicep rings I have a small strap glued from them to the shouler bells, this keeps them from falling down or turning around.
Forearms- Luckly on these my arms are small enough that I could just glue mine together and then put a little foam inside to keep them from turning around or moving up and down.
Thighs- With the thighs i have a leather belt on under neat the ab plate and this has two elastic straps looped over them that snap to the thighs. This keeps the weight off the abe plate and with the elastic straps will still move up and down slightly with your movment to help with range of motion. The thighs are glued together and you just slip them on then snap the straps to them and done.
Calves- These were simple, I just glued the front then on the back I used industraial strengh velcro that is held on by super glue. Remember to make sure the velcro is where you want it then super glue it. The humidity and sweat can make the velcros glue come undone. After that my calves never move, but if you happen to be thin just put some foam in them to keep them from moving around.
I hope this helps, if you want to know more about my set up just PM me or post and I will try to answer anything you have or send ya pictures.