Sort of agree with the hand luggage comments but, get a suit am.. you will need it when BA actually send your luggage to Zurich and you have gone home!
We had a colleague delivering a programme in Zurich and the courier failed to deliver on time. She flew in, found no programme materials so went out shopping and pulled it all together, just.. The programme was on change.... so she had some good anecdotes.
Do the meeting in your new suit as if nothing happened, then in the final pleasantries, drop in the story, your new suit etc and then see how impressed will the client be!