I am more inclined to use an Influence penalty rather than a hide one. Though hide makes a certain sense, mechanically it is not a skill you'd often use jointly with disguise. That would be tantamount to no penalty at all. Best items have their risks and rewards at the same time.
I feel as if Hide and Disguise could be used to "double stealth" so to speak and offer a higher mechanical advantage, which was my rational to having it as a penalty to outweigh Disguise. Influence and Disguise won't really offer too much of a mechanical advantage and I feel as if it'd open more roleplay options for the "unsavory" types like Tiefling and Drow who have invested in trying to be a part of society.
Edit:
I am still evaluating Dardonnas items, though I'll be honest and tell you right away that I have no intention of implementing anything that exceeds a +5 bonus.
I tweaked the items down a bit to where nothing exceeds a +5 bonus to Disguise. Even with +5, I still feel most of the penalties are appropriate (-3 hide for the ring, for instance), though I lowered the mantle's hide penalty down.
As for the items themed around Hazlani theatre, I think that's a great thematic honestly. I'm excited to see the set of items you've worked on when they're added or previewed somewhere.