Extra Item Space( Savage Species, p. 34)
You can wear more magic items than are normally allowed.
Multiple limbs or heads,
You can wear one additional magic item beyond the normal limit for the item type in question. The multiple limbs you have must correspond to the limb on which that item type is normally worn. For example, a character is normally limited to two rings, but a marilith (with six arms) could wear three rings with this feat. Likewise, an ettin (with two heads) could wear two periapts or necklaces instead of the one normally allowed.
You can take this feat more than once. Each time, it adds a new item space. You cannot have more item spaces than you have limbs or body parts of the appropriate kind.
Usually only one or two magic items that are restricted to a particular body part can be used at once.