Do not attend online lessons at home in your pyjamas, Hong Kong pupils taking an extended break because of the coronavirus outbreak have been told.While some local and international schools have not gone as far as to order students to don uniforms while sitting in front of their computers, they have told them to dress properly for live-streamed lessons.The Education Bureau on Thursday extended the closure of all Hong Kong schools, which have been shut since the Lunar New Year holiday, until at…