The towers were decorated with the school's banners. The school's banner had the castle with its name in kanji written across it, the background was white in color (no doubt) and the castle was… well, light brown in color.
The wizards were wearing bright white robes (to avoid the incoming summer sun rays and because Atama wanted them to), and the ladies were wearing a silver cloak over white robes.
The same was the dress code for the students, the only difference was they were wearing their year-wise robes inside and white cloaks over it.
The first years wore black robes and took the white cloak over them. Brown robes for the second year, navy color robes for the third-year students, the fourth-year students wore emerald robes and the final fifth-year students wore maroon robes.