Use common sense. Look in the mirror. Ask yourself if you would hire you.
You can have long hair. Just keep it clean and at least neat. Comb the crumbs out of your beard and mustache regular.
Change clothes at least 3 times a week and try to shower the same.
For God's sake, buy and use deodorant and toothpaste.
It's an honorable job we do. Don't embaress those of us that still love the job we do.