How to add passive items to TTT?

I’ve found that adding custom weapons to TTT is pretty easy, but can someone tell me how to add items like the bullet vest?

If you’re talking about adding it to the traitor/detective menu, I would honestly just make it into a SWEP, and grant the passive effects if the player has it. TTT has no easy way of adding passive EQUIP items, and it would just result in a lot of core-file editing.

Eh. I was hoping that wouldn’t be the case, but alrighty. Thanks.