The classic looks were a hodge-podge of different looks from a dozen different artists over forty or more years, creating a wild mish-mash of styles, and, compared to the more uniform looks looks the Reboot or Threeboot or 5YL or new Bendisboot eras, that kind of made sense, since this wasn't a team of thirty people from the exact same city, in the exact same country, on the exact same planet, but a group assembled from a dozen different worlds, and at least two other dimensions, and, in a few cases, the distant past (or future!). It would be weird for them to have a similar aesthetic, unless they were some sort of uniformed police force or intergalactic football league or something.
So, I kind of like that the 'classic' Legion had a lot of costumes created over decades, and in wildly different styles. It kind of fit the notion that Winath and Braal and Imsk and Orando and Talok and Naltor were *entirely different worlds* and quite likely had dozens of unique fashion trends *of their own* that might look weird or goofy or 'old' by the standards of someone from Earth.
And a few surprising similarities, like Cham and Trip, from Durla and Cargg, respectively, apparently thinking it's *ever* okay to wear orange and purple at the same time.