Armor.. uhh.. "Modifiers"

Iron armor full set makes your pickup range 3x bigger

Iron helmet does nothing

Iron chestplate makes you sink slighty faster in water

Iron leggings slightly slow you

Iron boots slightly increase your speed

Full gold set makes you slower and fall faster

Gold helmet does nothing

Gold chestplate makes you sink faster in water but also slightly increases mining speed

Gold leggings slightly slow you

Gold boots slightly slow you

Full diamond set makes you sink faster

Leather set makes you use slightly more hunger

Leather helmet makes you fall slightly slower

Leather chestplate does nothing

Leather leggings slightly decrease fall damage but slightly slow you

Leather boots slightly increase walkspeed and swimspeed