Date & Time: All the time
Frequency: Always
World name: Midgardsormr (and all worlds accessible using world visit, as well as instanced areas)
Character name: Kimara Lazale
Retainer name: n/a
NPC name: n/a
Monster name: n/a
Class/Level: WHM, SCH, AST/1-80
Party or solo: n/a
In-game time: All the time
Area and coordinates: In any area where you can zoomed out to the max
Housing: n/a

Steps:
1. Equip or glam Makai Moon Guide's Gown as WHM, AST, or SCH
2. Zoom out in any area to the max
3. Cast any spell that makes the gown wave around, ie Medica, Cure, Physic, Helios
4. Observe the black flaps on the gown clip with the grey part of the gown during skill or ability animations
4b. Alternative just run around and observe the clipping

See picture for example
https://i.imgur.com/Ft4HtJV.png

This clipping is also observed to a lesser degree with the following items:

Makai Manhandler's Jerkin
Makai Markswomen's Battledress