So, there are birdpeople/birdfolk in my setting. They're ~170 cm tall bipedal humanoids with a pair of functioning wings, slightly below the shoulders. They're covered with feathers, except for the hands and legs, both of which have talons, though smaller on the hands. Their necks are slightly longer than humans'. Birdpeople have a head and facial structure very similar to bald eagles in shape (same as humans' in size), as well as a beak (though the type of that can vary).
Now, just like dragons, they usually glide (assume patterns and speed similar to the andean condor) as flight is energy-intensive at this size, and daddy anon is yet to cook up a solution.
I was in the middle of designing the armor when the whole gliding thing hit me. That would effect armor design and in ways which I've never anticipated.
The armor is made of laminated linen plates and a thinner gambeson underneath.
What design (i.e: armor plate shape and placement) would provide the most protection and mobility with the smallest extra weight to a gliding birdfolk?
Assume medieval weaponry as the threat, with altitudes within range for bows and crossbows.
Note: Birdfolk don't have to worry about aerial attacks. The reasons are complicated, scaly and blue...