Ugg boots.

Maybe it was that it was slightly warmer--50s Fahrenheit rather than 40s--but no one was wearing Ugg boots in any of the parts of Europe I visited. That, or they have gone entirely out of style there, if they were ever in style there at all. I tend to think the latter, because there were plenty of people wearing boots, just not Ugg boots.

I noticed this because when I got back to the States, I started seeing them again.