IHM-32-BLK - Alpaca Lined Whipcord N1 Deck Jacket - Superblack
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Anybody ever tried to apply a water repellant to the N1?
Apart from using wax, a spray based water repellent appropriate for cotton fabric would be fine. On lighter coloured iterations it may darken the fabric.
That being said, the IH N-1’s perform very well in wet weather in my experience, despite being cotton. I wouldn’t wear it out in a torrential downpour or on a long wet day out, but as a winter coat around town it works. It doesn’t seem to absorb water easily. Rain has a tendency to bead and run off. I think it has to do with the tightness of the weave.
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Years ago I once tried this method with my IHM-04, mentioned by @tmg and @Aetas:
https://www.ironheart.co.uk/forum/index.php?topic=5615.90It's an easy job to spray the mixture on the wet jacket and to rub away some white residuals with a wet rag when the jacket is nearly dry. But honestly I don't remember if the jacket has been way more water repellent after that treatment (for a longer time).