When she entered the house, Renko heard voices in the workroom, so that's where she went. She found Azuki, Tsuruko and Hanako had arranged the suit and the things needed for the finished production.
"Sensei is using that book to put on the rest of the clothes," Tsuruko said. "He took Shota-san and my husband with him to help." Dressing was an awkward thing at best, and people often had help from attendants when dressing formally. Formal clothing was cumbersome, and there was no reason for anyone to think Western formal clothing would be any different.