Tips for dressing business casual

Mez • +they/them+ If my name changes it’s just part of my identity crisis🙃

I’m starting a full time office position at a small family-run nursing home. Being only 17, I do not have a lot of casual dress clothes, and I want to look professional to my coworkers because 1: Obviously don’t want to seem unprofessional 2: I’m basically a child so -10 professionality points by default.