I guess you can say “feel the pinch” as a lack of something (although I think it’s much more common to use it as trouble in general, like saying “in a pinch”), so that one’s ok I suppose. But pinch, absence, and deficit can all be used alone to mean a shortage, but I don’t think crunch can. It’s always a time crunch or money crunch or something. If you just said “I’m in a crunch” I don’t think you’d be understood as not having enough. So I didn’t know if it would be a pinch bra or plunge bra, and I associated a plunge with something going down to a shortage first.