Armor Stands

An armor stand can hold 1 piece of each part of any type of armor (including power armor) and requires a 1x2x1 space. To place armor in the armor stand, hold the piece you want to place onto it, and right click the part of the armor stand that corresponds with where the piece should go. For example, if you are holding a helmet, right click the top part of the armor stand. If you are holding boots, right click the bottom etc.

( the one from Better Storage is not added in, in our Modpack, so the one shown here is from Bibliocraft )

Source : http://minecraft-big-dig-pack.wikia.com/wiki/Armor_Stand