The phrase "more old-hat" typically means something that is outdated or no longer fashionable. Its antonyms would therefore be words such as innovative, modern, contemporary, or cutting-edge. These words signify novelty and newness, bringing a sense of freshness to a particular concept or idea. Other antonyms for "more old-hat" could include original, novel, groundbreaking, and unconventional, all of which suggest a forward-thinking and creative approach to any subject matter. By incorporating these antonyms into our language, we can describe new and exciting ideas that challenge the status quo and push us towards new frontiers.