Except this is a multiverse film and she can be whatever the hell they want her to be.Except it isn’t Kara who looks like that in the comics, it’s an alternate earth Supegirl named Mia Kent/Cir-El, who, in more recent comics, is a clone made by Brainiac using Lois’ DNA. So, yes, a supergirl looked like that in the comics, but not the one this movie is supposed to be interpreting.