When i look up Violet Beauregarde on Youtube, it comes up with two scenes, but also with stage show versions of her blowing up, and some of them, unfortunately, are really shit.
How would you make a suit that would inflate like the one in the film, because when she inflates in the 1971 version, her whole body inflates at the same time, like arms, legs and chest at same time??
The people who do the shows really need to focus more on making up actually 'look' like a blueberry... :cry:
Executing good Violet Beauregarde effects on stage is much more difficult than doing it with film (or video). From the very beginning of cinema even stage magicians like Melies appreciated the surreal things one can accomplish by "freezing time" -- stopping the camera while changes are made, the precursor to post production editing and effects.
The 1971 Willy Wonka and the Chocolate Factory used two different costumes to complete Violet's transformation. And although inflatable costumes were tried for the 2005 Charlie and the Chocolate Factory, the director opted to use digital effects.
I've seen some excellent blueberry effects on stage. However, most troupes must rely on artful creativity to "suggest" Violet's transformation, rather than showing it outright.
One additional difficulty is that the human form does not morph cleanly into a sphere. There are many inflatable suit makers who have posted in this forum, and some of their offerings are pretty spectacular. Look around.