I would have to say my style signature is my short hair. I've had it since High School. It started because we had swim team practice twice a day, before and after school. My long thick wavy hair wouldn't dry, ever. I hated it, and in the winter I was freezing. So, I cut it all off! It was the best thing I ever did and I have loved it ever since. I have had various short styles, but it has never been long again. Oh, and it worked. My hair definitely was dry again between practices.
My other signatures might be jeans, and glasses. I cannot wear contact lenses because of a problem with my eyes. I went for a few years with rimless glasses frames, but in general I have had funky frames in interesting colors. I don't know what to say about the jeans. I have always loved them, and wear them almost every day. When I interview for jobs I usually tell people that I will be wearing jeans to work even if there is a dress code (in other words, I don't follow the dress code).