What a dilemma Sharon. Maybe take in a plastic bag to put the test into. Like one of those zip lock ones perhaps.
Otherwise, you could use the excuse that your top was caught in the zipper of pants etc. Thats what took so long to get out. Although, this might not work forever as people might think that you can't even dress yourself.
Good luck with the testing and fingers crossed that you won't be having to do it for long.