As Ami of eschergirls and lady-knight- (in her comment) noted, it seems like Ange intended their comic to be subversive of fantasy clichés (so female virgins slay dragons instead of being kidnapped by them), but the execution indulges in harmful narratives (like demonizing women’s sexuality).
I don’t really think that letting scantily-clad warriors die for drama justifies making them scantily-clad in the first place.
It may work in comedy, but La geste des chevaliers dragons (or at least the first issue, the only one I managed to read) never makes fun of those costumes, just assumes we’re supposed to accept them as a sign of female empowerment or some other misogynistic bullshit.
The only character that commented on Jaïna’s non-armor was framed as a sexist dude who’s jealous of dragon slayer’s status, so… yeah, the readers probably weren’t supposed to agree with him.