We do train our raters to focus on the substance of your answers and not your clothing, but be mindful that certain clothing choices are distracting (e.g., pajamas).
While you don’t need to get too dressed up, it may help to think about how you’d like to be seen on camera by an interviewer. We recommend wearing smart casual attire like a dress shirt, sweater, or blouse, and pants to complete your Casper test. Remember that our raters are not evaluating your fashion choices, so keep it simple and comfortable.