https://wiki.project1999.com/Ulthork_Hide_Tunic
Not likely to find one for sale in EC but you could farm it yourself if you go duo/trio with some friends. Mobs are low 40's so you'd get decent xp in the process. The -hp sucks but otherwise a solid piece.
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Djynni Biqasmalyani - 60 Human Wizard
Mandak Battlebeard - 60 Dwarf Paladin
Maeghar Frightreaver - 56 Erudite Cleric
Maamdak Battlebeard - 48 Dwarf Rogue
Crunkasaurus Rex - 49 Ogre Shaman
Mendak - 51 Halfling Druid (Green)
<Paradox> RIP