Posting on this thread has spurred me to start re-reading the Legion again from the beginning in the Archives. With the early stories, I pretend that they aren't actually travelling through time but rather into the 30th century equivalent of a video game. There are different skins they can select, which explains why the details are inconsistent from story to story. The early Legion is just practicing scenarios with virtual versions of "Superboy" and "Supergirl" based on legend and surviving historical records. This explains why their first costumes, in the game (ADVENTURE 247), are a hybrid of Buck Rogers and 1950s fashion. I particularly like that Garth and Rokk are wearing pleated trousers. If I was designing costumes for the future--rather than going for space age designs--I would use fashions from the past as inspiration. Because in reality that's how fashion so often works--couturiers look at vintage and then apply those lines to their new creations. The Legion, especially Cosmic Boy, have a nostalgia for ancient history.