Your score in Training Challenges is determined by how well your outfit’s tags match the challenge tags.

For example, if the challenge tags are Vibrant and Glam, you will earn a higher score if you wear clothing that also has both Vibrant and Glam tags, or at least one of those tags.
Furthermore, you can boost your score with the Unworn. It’s possible to refresh the Unworn bonus on items you have already bought by clicking on the Reset Unworn button! You can max your Unworn bonus by applying to a challenge wearing clothing you haven’t worn before.