From my understanding, the costumes you’re seeing are the third or fourth iteration already. Employee Preview Night hinted at the problems. It’s not a surprise in itself - the scale of this issue it the big concern.
The costumes/masks are designed “in a vacuum.” They’ll prototype for fit and visibility, but they’re trying to make a one size fits all of a custom mask that meets the designers’ intents. The Mouthbrooders were meant to push an envelope, but they’re not tested in a house. They’re not worn for four hours a day.
Hell, the Catacombs masks had issues with long term comfort and visibility in the house. There’s just a disconnect. Depths is just hitting every single aspect of the issue.