Fake belly buttons are temporary tattoo-style stickers. Placed a few inches above your navel, they give the illusion of longer legs. One Chinese reviewer described them as “the most successful invention of 2023.” https://www.scmp.com/news/people-culture/gender-diversity/article/3230438/fake-belly-buttons-all-rage-china-women-seek-freedom-dress-and-boost-confidence-some-raise-body