It is not good to wear cos to the library. Don't wear cos to the library. First of all, exaggerated clothes will attract people's eyes and ears and make others think that you are showing off your dress. The library is a place with a large flow of people and needs to be quiet. Secondly, wear cos instead of taking part in activities, but go to the library. Cos discussion and debasement that would be regarded as meaningless if seen by other coser. If you want others to pay attention to yourself, you are not qualified to enter this circle. So it is not good to wear cos to the library.