Heard a similar story from an unfortunate aircrewman who had to do what he had to do somewhere in BAOR whilst wearing the ubiquitous noddy suit. Once the deed had been done, our hero of the hour was horrified to suddenly discover the somewhat baggy nature of NBC suits and that he had horribly miscalculated his anticipated drop zone. Amazingly, he used to carry a pair of scissors in his top pocket and was able to successfully 'cut away' as it were.
Didn't take long to reach this level did it...