I think it's because she only wears it under her suit, and it doesn't protect her from the vacuum of space.
The new chapter about real life space suits feels a bit hostile. Is this really the place for commentary about subsidized space research or technical plausibility of some research projects? I think I saw the part into examples under Real Life a couple of years ago, it has evolved into something really different since then.
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I agree that all the technical stuff about bio-suits etc. isn't really appropriate, but space-fanboys pushed in edits implying that form-fitting space suits are really ready now, and would be Truth in Television if only sinister subsidy-based government-industrial conspiracies didn't hold them back. For the sake of balance, one then has to point out that the bio-suit and other similar programmes are also government-subsidised, and have been "just around the corner" for more than forty-years.
The fact that such suits are not currently in use (whether due to research and testing that remains to be done, or some conspiracy by the "Big Spacesuits" industry) doesn't mean they aren't entirely plausible. Mechanical Counter-Pressure (MCP) suits work simply by applying pressure that counteracts the pressure of the wearer's innards trying to expand into vacuum.
Such a design is already entirely possible under the laws of physics, making this trope a misfit in a list of things like "Explosions in Space", "Space is Cold", and "Batman can Breathe in Space".
Do the suits worn in TRON count? They might be tight-fitting, but they are not space-suits at all. If they belong anywhere it would be in Space Clothes or somewhere?