The chainmail bikini has permanent Mage Armor in it, and it casts Shield for you when you need it.
Fluff: when active, it looks like the energy shields from Dune (the movie w/ Kyle MacLochlan). Ruin everybody's day - point a laser (or cast any Radiant spell) at the wearer.
I threw some +2 bikini mail in an encounter with some Ice Barbarians they slew, but they were running so hard after the encounter they left it in the snow. One of the guys was going to wear it so it sucked they forget it in the haste, as hilarity would have ensued.