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I never really took /r/myog seriously because a lot of the bags look shoddy, but the jackets look great. Will have a better trawl. This quote alone made looking at the first link worthwhile, would have never thought of this:
The trick is to cut all layers to the size of the outer shell, taking into account the thickness of the insulation. For instance if you’re going to have 1 inch thick insulation so the outer shell will be 1 inch from your body, you will have to add enough girth or width (and height) to the pattern to accommodate this. I took a couple of guesses with this jacket, and got a couple of things wrong, as I noted above. For instance, my horizontal down chambers puff up and effectively shrink the length by quite a bit, so the arms are a little too short.
Orders opening in september I think. ;)
:)
start here - https://backpackinglight.com/forums/forum/gear/make-your-own-gear/
and here - https://old.reddit.com/r/myog/