One of the first things we notice about someone is their style of dress. We make judgements about their personality, their state of mind, their confidence. And perceptions aren't just important, they may be everything. Seems simple enough.
I enjoy wearing suits. I believe my clients like it when they see me in one. My wife tells me I'm handsome in a suit. Prospective clients expect to see their lawyer-to-be in one. I've got a closet full of them. So for goodness sake . . . wear a suit.
Each time I meet with a client (except maybe weekends) or tussle with a prosecutor I like wearing a suit. When a client first meets me I want to make clear I'm a pro. In my business pros wear a suit. Nobody was ever impressed with a flip-flopper. Perception can be the difference between signing a new client or losing a sale.
So the rule is wear a suit. You just never know when perception will be everything. Appearances matter and first impressions last, especially in the life and work of a criminal defense attorney.