If you're talking about a rolled net strapped to the tank, that was done to a limited extent in the latter portion of the Korean War when it was more stagnant and tanks were used as indirect fire assets from static positions. They would park here and set up netting over the vehicle to provide shade and camoflage. Early in the war, they didn't remain in place long enough to justify setting up netting; so, they didn't carry the netting. Water, ammo and fuel were more important.

If you're talking about draped over the tank (netting resting on the tank), that would be wrong. I've seen artist renditions of that and it's neither historically nor tactically accurate. Netting draped on the tank impedes the tank's mobility and ability to engage quickly and accurately.