You have an opportunity to show off your communication skills here (a good thing in almost every job)! Try to get in touch with them and ask for specifics on what they mean by "casual". Generally you do want to dress a bit better than their typical, so figure out what that would be and ask them if that would be appropriate. There's no hard-and-fast rule about this. As James D. Campbell said below, Know Your Customer!

Good luck!

Know your customer! You should be ok dressing at least 1 level up. I have worked as a management consultant for companies that have a strict no-suit dress.code. If you came in a suit to this customer, you would be shown the door and would not have your interview. For other companies, if you don't wear a suit you will damage your job prospects with them. Bottom line, know your customer.

My opinion is that, you should dress.Accordingly,to the position.For which you applied.

You can wear something comfortable like a nice pair of slacks with a comfortable blouse. You can even put on a nice casual skirt with a nice summery shirt.

Just go like you're going to a concert dress like its a sporting event but you have to cover up nothing showing or wear some blue jeans a nice pair of low heels shoes and a nice top

Always dress for the job you want in the long run not necessarily the job your interviewing for. Also tell them that. You see yourself being there for along time and running things one day after proving your worth. Always treat every job as a formal interview to run a company.

Its an interview, regardless of what they say... always, always dress professional. PERIOD...

Hey Kathy - I would suggest going with business casual. Either a skirt or slacks with a nice top. You don't need to go formal with a suit or anything like that. They may be more casual than that, but business casual is a safe median to use for most interviews. Good luck!