What was the most effective camouflage pattern in WWII?

Perhaps it’s just me, but Luftwaffe was eons ahead other air powers.

As for camouflage overall, Simo Häyhä easily takes the crown.

Simo is the textbook definition of effective camouflage.

• He wouldn’t use a scope - scopes of the time didn’t have any anti-glare covering, and the sun could (and frequently did) reveal the sniper’s position. Simo’s preferred anti-sniper technique was exactly this - he would stand still, searching for scopes being denounced by the sun.
• He would wear a mask, and also often had snow in his mouth, so that his breath wouldn’t condense in the air, announcing his position.
• He would compact a pile of snow just ahead of him, so that his rifle would have a stable mount, and the muzzle blast wouldn’t form a cloud.

All of Simo’s kills were obtained in less than 100 days, in a time of very reduced daylight duration.