I admit I was inspired by an artwork of Softballonpony ([https://www.furaffinity.net/view/17803277/). But in that version it was an inflatable suit, not really my thing and the others weren't as fuzzy as I wanted them to be. So I decided to make my own fuzzy and more plushy version of it.
The details:
The person trapped inside is over 18- and fictitional, it is your guess whether volunteery or... you know.
The zipper is connected to the necklace, fastened with a cloud-shaped lock.
Inside of the necklace is a voice-changer, turning every sound into Rainbow Dash's voice and voice-lines.