THORPEDO PANTS IAN THORPE forfeited the swimming pool for the catwalk yesterday to launch his new line of underwear,IT. Internationally known as 'The Thorpedo', the Australian swimmer has three Olympic gold medals and holds multiple world records, but he is still keen to break into fashion. He and a host of somewhat shy looking athletes and models paraded on a catwalk in Sydney hoping that the skimpy cotton smalls, which are expected to be available over here next spring, will do just that.