>>54703304>The Treasure Hunt is a school assignment, you are on school time. Hence you wear the uniform.Penny wore normal clothes the literal second you see her on the first day of school and every single day after. Clavell does eventually make a comment about being out of dress code to the entirety of Team Star's leadership, but he also dismissed it as an issue so the idea of "unity" and school spirit a uniform would entail straight up is being thrown out the window.
Of course, that's talking about in-universe reasoning and not the absolute retardation that is being able to pick between 13 options for fucking mole placement but not being allowed to wear a long-sleeved shirt without fucking suspenders.