She's peak conservative wife type idol and there's been vast proof she doesn't like to show off her body at all, in fact the recent outfits in general, say the past year as a whole, she's been showing more skin than the average historically. Literally her stage name is a religious reference, it's based on her baptismal name Katarina.
She's also quite insecure with her body since she does have weird proportions that can easily be off depending on the outfit, the current outfit makes her legs look short and focuses on her soft belly too much which would make her look fat by korean standards.
This doesn't mean she's a prude or something, remember that she got caught out there in the streets going to her bf apartment to get railed lol, she simply doesn't like to be like that on stage due her overall introvert personality.
Last year's outfit was great with all of that in mind, the transparency was enough to show off all her goods, the current one hides everything but it's ugly as hell, but again, expecting her to behave like the KIOF girls or Eunbi even was retarded, she's not an irrelevant idol like the majority of the ones that perform in this place, she doesn't have any reason to be there unlike others that are there cause they need to pay bills.