Personally i have taken the "casual" approach
I'm rather young i guess for the business, but decided to take my own approach on things. Having bought a few cars in my past, and spend many afternoons looking, the sharp suited salesman, who’s bathed in aftershave and has it seeping out his pours, designer stubble and fancy watches put me off, as does the constant being referred to as "Sir or Gentleman".. Of which.. i am neither. Pompous door opening, adjusting my seat for me... i am more than capable of doing it myself..
I guess it’s all down to person preference, but it really puts me off, and gets my back up
I go for the laid back approach, I’m sure some of you veterans may not agree, but we all have our own way. I go for the smart and always polished leather shoes, Suit trousers and a well fitted, company embroidered polo shirt, and a smart V neck sweater. I don't feel comfortable in the suit and tie, and is easier when I’m mucking in cleaning cars, sweeping the showroom etc.
Also, I don’t go for the Sir/ Gentleman.. In the words of old Swiss Toni, i mirror my customer’s attributes. If they are a youngish guy, occasionally I may refer to him as mate (I am from Leicester after all) or ask if I can address them by their first name, much more friendly, personal and relaxing for both me and the client I feel. Obviously an older gent, I will call "Mr …," his wife.. "Young Lady"