Okay here's an idea for all you clothing making experts out there. I have an REI Polarguard Jacket. I think its the Spruce or somethign like that. Its the one with zip off sleaves. It weights about 17 oz and its XL but I'm fine with a medium. I would like to make it a bit smaller which I assume will make it warmer and also make it lighter. Here is what I propose to do.
1. Remove the sleave zippers which I never use. I'm thinking about folding around the zipper and sewing the sleave and torso together about an inch in from the zipper. That way I don't have to figure out how to pin the sleave on for sewing (which I hear is tricky). Than I can just cut the zipper off.
2. I will take out some of the extra room by creating a fold either down the back or along the sides and sewing it, than cutting out the extra.
3. I might also cut off the front zipper and turn it into a pullover.
Questions
1. how hard would all this be? I've done packs and I'm comfortable with that but clothes seem to be a whole new level of complexity. I turned an old sleeping bag into a vest and that was tricky (partly because I didn't have a good pattern to work with).
2. How much weight would each of these mods save? Jackets made with similar materials are in the 10 oz range so theoretically I could save a lot of weight. I'd hate to spend a whole weekend on this and barely save any weight.
3. Do you think insulation being equal a trimmer fitting jacket would be a bit warmer? Seems like it but I'm not sure.
Here are some pictures.



