All I can say is, in my real world experiences wet fleece is better than exposed skin even when exposed to wind in keeping you warm. Fleece although not usually windproof (there are some that are), does provide some protection from the wind. As others have stated, you can wring out or let the fleece drain, add a plastic bag or even one of those cheap survival blankets to block the wind and you have an effective system, not perfect but better than exposed skin.

Pete