Sabine Wren - Action Girl

There were 4 questions about the origins and/or meaning of new armor markings I asked to see how many attentive watchers (of me, of Rebels, of Star Wars) do we have around: 

1. Origins of the new logo on the shoulder plate. 
2. Meaning of the orange symbol on the hip plate.
3. Origin of the white pattern on her leg.
4. Meaning of yellow symbol on her other leg and what it stands for.

And there are the answers: 'Sabine Wren - Action Girl' Explained.