I have seen appraisers dress like:
A business person in a suit and tie
Shorts, sandals(flip flops), ball cap and torn shirt
Larry the Cable Guy
Joe the plumber
And a wide assortment of other methods.
I was discussing the possibility of a young lady who was interested in being an appraiser, who came to see me in my office yesterday. She is smart, well dressed, well educated,(4 year degree in business), and has a background as an insurance claims adjuster. I helped her form a plan to get her trainees license, get the required pre licensure courses, and find a place that might assist her in getting the experience she will need.
She will likely be successful. Then I thought about the last big year in the number of persons interested in getting into appraising, which was 2007 prior to the new requirements of 2008. It is very likely that less than 10% of those people will ever see an appraisers license.
Some were dressed like escapee's from a rag factory. Some were better suited to be tattoo artist as they were covered with same. Some were not as well dressed as Larry The Cable guy. Maybe, just maybe 10% were dressed well enough that I would have allowed them to come into my home.
Think about who you would let into your home, and consider if the appraisers you know dress at least that well. I am sure that will vary by location, local norms, etc. But that would be my standard before I would allow someone with a clipboard and a camera into my home, taking pictures and poking into every area of my home, things I would not ordinarily allow one to do without a search warrant.