As far as I can tell, the only innate option MV has is it lets you disable the use of spells and skills when a particular state is applied. On the state page, double click on a line on under Traits to bring up the mini menu. Under the skill tab, select seal skill and then the skill you want to disable from the drop down box.
If you want to disable items and weapons, I believe you would need to use a plugin. Himeworks' Actor Battle Commands looks like it may be appropriate for this task, but you'll have to play around with it to be sure. You can find it here: http://himeworks.com/2015/12/actor-battle-commands/
If you're using Yanfly Item Requirements make sure you have Item Core and use this notetag in the notetag box of any items that's going to be affected:
<Custom Enable Requirement>
condition = !battler.isStateAffected(x);
</Custom Enable Requirement>
Where x is the state that's going to disable the item
I really tried to pull off something for halloween, but I don't feel like going on. I feel like the plot I was building was too generic, and I couldn't connect to it as I do with other projects. On the bright side, I've been working on my cosmic-puzzle project, so far I think the core mechanics are working properly, so I'll be creating some large test maps to see how it works out.
M.Healer: I'm wearing M.Mage's Costume. M.Mage: I'm wearing M.Healer's Costume. M.Knight: Why not using the Scary Costume like me,The Scary Frankenstein? M.Healer: Err…Because we have low of Budget. M.Mage: Yeah,right.