After dinner, we cap off the evening with a boat ride on the Seine. It's possible that it could feel a tiny bit chilly in the night air, so while I don't know WHAT I will be wearing, I do know that I will bring a light jacket or sweater along.
Here's how to have it both ways: be sure that your little luggage lock has a symbol on it like this:
It doesn't matter what brand you buy (and you can get the locks at Target, AAA Travel, etc), but look for that little red diamond TSA-approved symbol. (They are made so that security can open your lock if needed, without destroying your lock.)
And if you have any old 'unapproved' locks, you could throw one or two inside your luggage (and their keys!) for the hotel. Now, we will be staying in nice hotels. And- it's just best to reduce temptation when you can, right?