Why hide a pocket inside an arc?
A pocket opening is also a path for the hand and a load on the side seam and front body.
Two arcs carry two concealed pockets.
The current S84 record places two 17 cm concealed hand pockets inside the arcs. A raglan sleeve and underarm room are reserved for everyday actions such as lifting an arm and walking.
The position is set. The load is not.
The structural position is the confirmed fact. Whether the side seam distorts or the front stays composed after a hand and personal items enter the pocket still requires a physical sample.