I had thought about it, even having different types of underwear, but then I considered a situation or idea: Crystal Academy seems quite closed-minded regarding image, reputation, and possibly clothing, seeing how everyone always has serious faces. So I thought that unlike Canterlot, where each girl wears what she wants, at Crystal Prep Academy everyone is limited to wearing almost identical uniforms with few variations. So, perhaps underwear could also be regulated.
But I also liked your idea; it wouldn’t be bad to implement it.
