Love this! I lived in France for a few years, and it took some getting used to going for a walk in the park near the office building where I worked and seeing women in the summertime simply remove their top and lay out on the grass to sun bathe. I am *not* making this up.
Differing cultures are very interesting. I was stationed in Italy some years ago (I won't say how many - too many) and some colleagues tried to get on the bus to the beach wearing bathing suits and cover-up shirts and they were not let on. They inquired at the hotel and were told that would not be allowed, and they would have to wear street clothes to get on the bus and change into their suits at the beach. So they changed, got on the bus to the beach, and when they arrived, asked some random person they found who could speak some english where they could change, and they were told "anywhere you want around here is fine". They didn't understand the answer, until they saw a local man walk onto the beach, strip down naked, put on his "speedo" and lay out his towel. So they did the same.
So it was OK to strip naked on the beach to put on your suit, but not OK to wear the suit on the bus. This is normal in that particular local area and in many places in France and Italy (and other places I imagine).