Helm of Darkness should make mobs treat you as if you have no armor on

[Jackiecrazy]

After all, you're completely invisible, items and all.

[skyjay1]

I don't play enough minecraft to know what you mean. What do mobs do differently when you're not wearing armor?

[Jackiecrazy]

Each armor piece worn increases the range of detection for mobs by 17.5%. It goes to 77% (normally 7%) of the usual detection distance while wearing a full suit of any armor.