Armored Kilt

When you add an armored kilt to a suit of light armor, the set counts as medium armor. Likewise, a kilt and medium armor counts as heavy armor. Adding an armored kilt to heavy armor has no effect.

Light armor
Armor	Cost	Armor/Shield Bonus	Maximum Dexterity Bonus	Armor Check	Penalty Arcane Spell Failure Chance	Speed (30 ft.)	Speed (20 ft.)	Weight. 1
Armored Kilt*	20 gp	+1	+6	0	0%	30 ft.	20 ft.	10 lbs.

Source Adventurer’s Armory, Pathfinder Campaign Setting