From Ron Miller at Maryland Injury Lawyer Blog, "Rolexes and Introductions"--
My style is conservative in that I wear “please don’t notice my clothes one way or the other” attire. I would feel uncomfortable with a diamond hoop earring and a gold bracelet. But some lawyers with traditional clothes look like your Uncle Bill at a wedding: miserably out of their element. If that is who you are, be who you are. Juries are going to say, "Hey, he/she is not like me, but this is a real person."
There's more explanation in Miller's post, which goes on to discuss how to start an opening: Should you introduce yourself and your client before beginning, or not? Miller gives the right answer.