Installing a 200 amp.sub-pane (type D- Hom), the main panel is 200 amp.also, I'm using 2 /100 amp. Breakers. My question is : what wire size do I need for the jumper to connect the two breakers.
I'm using #2 X3 and #4 ground wire to connect the sub-panel, do I need the same#2 for the jumper?
Or what will be the best way to connect it, Six lines plus ground to the sub-panel or Jumper, and again what wire size?

First off, a double pole 100A breaker is not 200A. It is a 100A breaker.

You have a main panel, fed from the meter. Then you have a sub-panel, with a feeder from the main to the sub.
What are you referring to as a jumper? I can't grasp what you are describing.