The Ghost Sail is a cloak dropped by the Ghost Ship. Not an outstanding item, but it does offer a general stat boost and reflection bonus which any cloak-wearing combat character could find useful.
Weight: 8 | Level requirement: 30
Damage reduction (armor): 6
All stats (HP, SP, MP, Str, Vit, Agi, Int, Wil): +1
Reflect negative: +1%
Reflect positive: +1%