It seems this 'hat' has been abandoned for a long time in rice field and became pink?

Reduces damage taken from Player by 13%.
Indestructible in battle

When combined with Steel Chonchon Card:
Immune to Frozen status.
Has a chance to inflict Freeze status to all enemies around (11x11 cells) when receiving physical or magical attack.

[Constipation set: Pink Poo Poo Hat, Sandals [1], Steel Chonchon Card]
MaxHP +4%, MaxSP +4%.
Every refine level of Sandals [1], MaxHP +1%, MaxSP +1%.

[iRO Description]
Nobody knows why it's old and pink. You put it on your head anyway.
Class: Headgear
Position: Upper
Defense: 0
Requires Level: 1
Usable By: All Jobs
Reduces damage taken from Players by 13%.
This item cannot be upgraded.

Set Bonus
Old Pink Poo Hat [1]
Steel Chonchon Card
Immune to Frozen.
Adds a chance of inflicting Frozen on any target within 11-11 cells of the user when receiving a physical or a magical attack.

Set Bonus
Old Pink Poo Hat [1]
Sandals [1]
Chonchon Card
Max HP + 4%
Max SP + 4%.
Additional Max HP + 2% and Max SP + 2% per upgrade level of Sandals [1].