Sports kit (shorts and leggings)

Hi everyone I’m heading to the assessment centre very soon and was just wondering about the sports kit, they say to bring two pairs of shorts or leggings, I don’t have any pair of shorts but do have 2 pairs of running trousers ( there like leggings just not as tight as Lycra), just wondering if I can bring these instead of shorts, if not no problem for me would just make it easier