Just going to revitalize this thread and simultaneously give a thought on how to perhaps get this thread more active:
The largest amount of support seems to be for her to use her Saurian outfit in the series.
However, the Super Smash Bros. series is pretty notable for making small modifications and mixtures to character designs and attacks. For example, Fox's current design falls somewhere between Command, 64, and probably a few others in terms of looks, and even has some Super Smash Bros.-only aspects in it (For an example that hits me off the top of my head, Firebird actually started as a SSB attack, only entering the Star Fox universe via Star Fox 64 3D multiplayer after the fact).
One such modification, which is a bit more necessary than others, is made to characters where things might otherwise get... awkward with the SSB series camera. Kilts or skirts in particular get changed (in particular, Link and Pitt bo
th got distinct sets of shorts or pants). Krystal's Saurian outfit seems like a manifold case in terms of having both a short and, er... open groin covering (at least if it were a long dress, the whole "legs disappear into a void" solution could be used, as seen with Peach and Zelda)
and not even really having a "complete" one at that (
this fairly popular drawing in the SSB Miiverse community perhaps inadvertently shows the problem [or solution, if that's what you're into] with her outfit as it's currently designed).
So as a hype-building exercise, how about having a de facto contest to redesign Krystal's Star Fox Adventures outfit into something more SSB-friendly? As with all SSB outfit redesigns, the end goal would be an outfit which keeps the character clearly identifiable with the character from the series at a glance, but at least slightly more modest and, if possible, more detailed than in the original game.