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A Breastplate is a decorative tattoo across the chest usually below the neck and above the bosom centered on the sternum but not always. Like some breastplates of the middle ages had insignias like winged eagles or family crests. Many breastplate tattoos look symmetrical but symmetry is not necessary.
Look at Porn Star Misti Dawn's breastplate... it really accents her cleavage.

Where'd you get that breastplate and sleave? Very nice artwork.
by Porn Valley (@porn_valley) January 19, 2012