This hack will let you put on you amour very quickly. This build is kind of hard for me to explain so this hack will be following the pictures.
You will need: 3 droppers, 6 oak wood planks, one pressure plate, 2 dark oak planks, 2 dark oak doors, 6 dark oak planks, amour of you choice.
Step #1: Place your dropper and oak wood planks like in the picture.
Step #2: Place the pressure plate on the bottom dropper. Then place the dar oak trapdoor like in the picture bellow.
Step #3: Place your dark oak planks and dark oak doors like in the picture.
That's it! sorry if the instructions are not clear. Now if you walk on the pressure plate the dispensers will put you armour on.