Mutant Fish Scale Armour (3.5e Equipment)
From D&D Wiki
Mutant Fish Scale armor: This is a +4 Scale Mail made out of light green fish scales. It doesn't smell good. It doubles your land speed, and adds 10 to your swim speed, but removes 2 from your Charisma.
CL 5; Craft Magic Arms and Armor; Cost 2,000 gp, 1,000 xp; Weight: 25 lb lb.; Market Price: 3,500 gp