Kilts and a mountainous environment: a traditional Scottish scene. Relocate to Switzerland and add a snowboard = misplaced national pride fail. A girl and a skirt: another traditional combination. But on the mountain on a snowboard? Hmm. Inappropriately drafty clothing fail.
It doesn’t matter that it’s apres and you’re not actually skiing. You’re still on the mountain. And you shouldn’t be wearing anything like this in public. Ever. You know who you are.
On the mountain wearing a onesie? Almost certainly a fashion fail. On the mountain wearing a matching onesie with your skiing partner? Like the previous answer, but without the ‘almost’.