What kind of action is pulling off a headband?

[GeneMemeScene]

My character has a jewel on his forehead that has an Umbral Arcane Mark on it, for quick-use darkness. He keeps it covered with a headband so that there isn't a highly conspicuous dark cloud walking around at all times.

But I'm wondering exactly how quick I would be able to remove the cover? My idea was that is was a loose covering so it could be pulled off easily, but even Tear-Away Clothing takes a standard action to take off. Are there actually rules for removing (and dropping) miscellaneous stuff, or does it just come down to asking my GM to let me remove a headband as swift or move?

[Claxon]

Manipulate an object is a move action, IIRC.

[SlimGauge]

If something is already in hand, it's a free action to drop.
If something is not already in hand, it's usually at least a move action to get it into hand (barring something like quickdrawing a weapon or using a spring-loaded wrist sheath).