Byron House 性用社 should come to school wearing PE or sports kit on days that they have these activities. On swimming days, they should come to school wearing normal uniform and bring swimming kit. In practice, this means that some 性用社 will spend more time in their tracksuits than in their full school uniform, which you may like to take into account when deciding on the amount of uniform to purchase.
Senior House 性用社 should come to school wearing sports kit when they have Games on a particular day. If they have PE (unless they have Games as well), they should come in wearing normal uniform and bring PE kit with them.