The components that are controlled by your C1 outfit (meaning your texture 0s or low texture) are your mask, accessories, torso 1, gloves, pants and shoes. These components are triggered using the classic parachute.
The C2 outfit controls your helmet, torso 2, armour and logos (texture 0s or low textures on the C2 side). These components are triggered using the Israel parachute.
By placing textures on the opposite side that are higher than what is available on your t0 side, it creates an impossible texture and will therefore merge.