I have one of these smocks,in an unaltered condition.During the last winter I wore it a great deal whilst walking the dog,often in falling snow,and it never let any water in.If I were you,I'd give it a chance to so that you can discover how waterproof it might already be.The fabric is quite a heavy weave,and should resist some rainfall.
I wore my snugpack jacket underneath,and was almost too warm.
No doubt about it,they are great smocks.Good luck,whatever you do with it.



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I have yet to attach it but been looking at ways of doing so. If it is detachable it would make the smock easier to wash. But it wouldn't look as nice sitting on the hood, I could do popper buttons as Pignut suggests. 






