I dunno, but the times I have left DS I have worn maz bp and taken a towel (face washer size but thick) in my handbag JIC I felt full then I could slip off to the bathroom to express a little. And the one time I forgot my bp during the day I did leak, so I ensure I always wear them.

But, with your outfit though... I know they are not nice but do you have any disposable ones? cause they would do for a night out...

Good luck, and enjoy your night out!!!!!