The Rick Steves’ Europe website has some useful packing lists and packing tips for both men and women. There is also a printable packing checklist you may download from his site if you like. You may also reference this packing list from Prométour.
Obviously, you are in a somewhat different situation than people traveling alone using a Rick Steves tour book. (You won’t need to bring a towel, detergent and a clothesline, for instance. You can do some laundry before you leave Brest and there will be towels in your hotels). Therefore, don’t see these as lists of requirements so much as helpful guides to help you remember things like your phone charger and plug adapter, insurance card, and to avoid bringing too many clothes.
Most importantly: pack light and be sure to have comfortable shoes. During sightseeing tours, you will be doing a lot of walking. Additionally, make sure you have a jacket and some layers. It is likely to be in the mid 50’s during the day and the mid to low 40’s overnight. For the beginning of your trip, you will be right on the coast and, as you know from personal experience, it can get chilly. It’s also smart to be prepared in case it rains. Click here to check the weather.
Bear in mind that when the French students were here, they only had to unpack once, in your house. You, on the other hand, will be moving from hotel to hotel in your second week. You will be sharing a small space and you will be responsible for carrying your bag. PACK LIGHT. It is far better to bring a few well-chosen items that can be worn in various combinations than to bring a unique outfit for every conceivable occasion.