What should I wear to pick up a job application at baskin robbins?

I am planning on applying for a job at a local baskin robbins ice cream shop. I read online that they are hiring at the location near my house, and I am going to pick up an application today or tomorrow. What should I wear when I go to fill out my application? I don't want to dress up too much because it's just a baskin robbins and I don't want to look too keen, you know? And also it's 100+ degrees where I am so it's really not feasible to wear pants. Thank you for any help/suggestions!