They would have to change color scarves. The robes are black though either with the Hogwarts crest or they sew on their house crest. Whoever said that they didn't mention scarves and ties in the book is wrong.
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Um, they don't have light bulbs. So it would take 3 Ravenclaws. One to explain what a light bulb is after a ravenclaw took the light bulb and wiring apart and the last one to put the wires and light swich back together.