Not necessarily. If you are going on a short trip and not planning to stay out for too long, you can go without a proper fishing bib or with a non-professional jacket. Yet, if you are an avid angler, facing harsh conditions or plan to go ice fishing more than once - you absolutely need a full suit. Underestimating weather conditions is the worst mistake that you can make. Complete ice fishing equipment will protect you from freezing, hypothermia, or soaking. Most importantly, it will keep you safe.