Why was everybody going to Titan??? In suits?? What was their mission???

In Gattaca Vincent claims that no one knows what the surface of Titan is like due to its dense cloud layer, and proudly states that his mission will be the first to discover what's really down there.

At the time the film was made, this was true. However, in 2005 the Huygens probe landed on Titan and photographed the surface.

What, you thought I was being serious? 

They were going in suits because the advanced technology of their space capability enabled them to maintain the preferred aesthetic style of their society - even while traveling.

The whole of Gattaca is depicted as a 1950s or earlier, noir throwback on the surface, but underpinned by future technology that is well in advance of the way things look. Eg all the cars look like 50s/60s coupes, but whine because they are electic.

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That part kinda annoyed me to be honest. They were going up to a mostly unknown environment, just dressed in regular suits? I mean I understand the movie wasn't actually about the space travel at all but still.

I am a God

That's what I considering the biggest flaw in the movie. I think a back story about people migrating off the planet would be more interesting but maybe that didn't want to be too much Blade Runner. We don't get a whole lot of motivation for him to go through all that trouble.

Sorry, other responders, but I think you're missing the point. What was on Titan didn't matter at all; what mattered is that it was his dream to go to space; a powerful dream that inspired him.

Also, it's clear the intention was to tell a solid and thought-provoking science fiction story without relying on the usual tropes of aliens and space battles and laser guns. The filmmakers even gave it a stylized, archaic look, so that it's feels both familiar yet exotic, retro and futuristic, and NOT "realistic".

The characters and story are front and center, not technology or special effects. Considering how well it achieved that goal, I think it's a bit silly to quibble over a costume.

The idea of wearing suits during space travel has been touched on. Regarding why go to Titan? It's a rich mixture of atmosphere, oceans and geological landforms.

I am the Alpha and the Omoxus. The Omoxus and the Omega

The movie wasn't really about going up into space. That was just the ultimate prize that was motivating Vincent. This movie was about bigotry based on genetics and about how drive and determination was actually more important than natural ability derived from the genetic procedure. It was about overcoming deficits and exceeding the limitations society places on you based on your biology.