The opposite of "more trendsetting" could be seen as "less fashionable" or "outdated." These words suggest a lack of innovation or style, and a failure to keep up with current trends. Other antonyms might include "conventional," "commonplace," or "ordinary." These words all suggest a sense of predictability or familiarity, rather than the cutting-edge appeal of trendsetting fashion. It's important to note, however, that antonyms can often be subjective. What one person sees as trendy and fashionable might be considered mundane or even unappealing by someone else. Ultimately, the opposite of "more trendsetting" will depend on individual opinions and perspectives on fashion and style.