Not to derail this into another subthread about the politics of sweden, but who are you refering to? The only one I know who have made such a promise was Kindberg-Batra when she was a candidate for the Stockholm municipality.
I meant Lööf, I did not know Kindberg-Batra had broken a similar promise.
Well she (being a bit of a edgelord in her younger days) promised to "show skin" if she got elected, and some people thoght that they would get a strip tease or something like that. As I remember it, she did post a square super zoomed in image supposedly of her body but it was impossible to actually identify any specific body part.