Honestly, there's no point in wearing one or even making one. I mean.. 10 grass? That's not even worth it.
The grass suit should be moved to the Dress tab instead of the Fight tab and be given 60 insulation instead. This would give newer players an intermediary between more advanced forms of insulation in the winter. This way, they wouldn't have to wander around looking for materials to make the simplest forms of winter deterrent; The bunny hat, and thermal stone. Both of which require relatively heavy time investment for a winter start. It would also become the winter analogue to summer's pretty parasol (extremely easy and simple to make).