What you really should do is go to the company is a few days before your appointment at the opening or closing of the day and see how the employees are dressed. Are they wearing jeans and T-shirts? Wear nice pants and a collared shirt. Are they wearing nice pants and a collared shirt? Nice pants, collared shirt and a blazer.
Etc.
You want to dress one step above whatever is standard for the company. If it's a jeans and T-shirt type of place you don't want to show up in a suit and tie.