At 50 degrees I also need a hood, but you may be able to manage without the ice cream headache until the 40's if you just stay practicing in cold water.
You don't mention how dry your skirt is. If it is one that lets in a lot of water, the answer will be a reduced version of the next one.
If you don't end up swimming, the drytop (and an appropriate layer underneath) should be enough. If you do fail and have to wet exit, just the drytop is still going to leave you with a wet body and a need to consider hypothermia, either in the water or up in the air if it is also windy, chilly or cloud covered.
2-3 Canoe/Kayak Trailer
4-place Boat Trailer
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