Part of the belt is vanishing when you equip a shirt body piece. Here a screenshot:

http://i238.photobucket.com/albums/ff11/lienn_stuff/bug0001.png

Platform: PC
ISP: BrTurbo
Type of Internet Connection: ADSL
Internet Connection Speed: 2MB
Date & Time: 04/21 ~6PM
Frequency: rare
Character Name: Severino Cangaceiro
Race: Roegadyn Hellsguard M (also seen in a miqo'te KoM F)
World: Istory
Class/Skill Rank: PGL 1
Physical Level: 19
Area and Coordinates: -
Party or Solo: -
NPC Name: -
Monster Name: -
In-Game Time: -
Steps:
1: Equip a Dodoskin Field Belt (not sure if happens with other field belt versions)
2: Equip a Cotton Shirt (also works with Hempen Shirt versions...not sure about others)
3: The part of the belt with the "kunais" (no idea what those blades are) will vanish.