In the world of fashion, "bad style" is often subjective and can vary from person to person. However, there are some common faux pas that many people agree on. For instance, wearing clothes that don't fit well, either too tight or too loose, is generally considered a bad style. Mixing too many patterns or clashing colors can also create an unappealing look. Lastly, wearing inappropriate clothing for the occasion, like showing up to a formal event in casual attire, is also seen as a fashion no-no.