The weather in Rome while we were there was mostly lovely, 60s and sunny (one day we had a little rain) - the kind of weather that brings out flip flops, shorts and tank tops in Chicago.
In Rome they were still dressing for winter, with leather jackets and skinny pants or jeans tucked into knee-high boots. The only people who were wearing flip flops were American tourists (not me).
Also, when they're wearing skirts or dresses they wear hose or tights, no bare legs. Totally anti the trend in the U.S. where bare legs, even in winter, are the norm.
That's one of the things I love about traveling - seeing how customs and trends vary, not only in Europe but in different parts of the country.