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I say that space faring races develop skin suits as a natural evolution for safety concerns in case of a hull breach and your atmosphere is leaking into space really fast. Vacuum, after all, is non prejudicial to sexualized or non sexualized characters. Wether you wear loose clothing or armour, if what you wear doen't fend off the inevitable cold of space nor be able to support you in a vacuum, you are toast! Which is why body fitting suits are the best design.
Now, if you live in a breathable planet there is room for a varied number of sartorial choices.
My take is that once you have a spaceship and it travels in space, the crew in said ship must wear appropiate suits for survival, in case of a ship wide catastrophe. It is the reason why a carrier, for example, has all kinds of safety rules. clothing rules and colour types and vests and on and on.... especially if you walk the deck! To have someone complain that the clothing worn by these sailors are, say unisexual, is the height of stupidity with no concept of what is required to live and work in a ship and maintain a safe environment.
Take the promo video. The combat suits are form fitting. They need to, to protect you and provide freedom of movement. Also, it is not unsurprising if the manufactured suit also provides a mechanical assist, when running or when lifting or carrying a backpack. These enhancements are necessary to give you an edge over the enemy. Non of this is possible wearing baggy clothing to remove the suggestion of sexualization with clothes/suits.
Really guys, I much prefer a game I can enjoy than chirping about tight fitting suits.