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Quite a stupid one over here, but so be it.
Taking into account how Scrafty parades around with pants and hoodie that were once its older skin, I started to entertain a thought that this white layer that is a highlight of Ralts line might be a case of living cocoon that breaks apart, shifts position, extends, overlaps throughout the evo stages to fit developing body.
As in:
Stage one:
-living bodybag
Stage two:
-living bodybag splits apart to allow for unrestrained movement
Stage three:
>Either:
-in Gardevoir's case, cocoon divides in two parts
>Or:
-in Gallade's case, all of it, part of facial layer included, slides down to create that awkward lower body enveloping.