I had a bad experience, this was some local server hosting company and I walk in there, granted I'm not wearing slacks/dress shirt so perhaps I'm not better but both the people I interviewed with (owner and an employee) were wearing sloppy clothes like basketball shorts, stretched out t-shirt, etc... and I read some reviews from former employees at this company on Glassdoor, I did not get a good vibe due to the mostly-negative reviews. I didn't get the job but what I didn't like the most is they never called me back or anything, they didn't say something like "We're sorry, we reviewed your application, you're not a good fit." I'm probably not the most social person anyway, I have a look on my face like "I'm miserable/tired" but I talked with a low tone/calm. I don't know, at least I have a day-time job and have some clients.