I didn't use a pattern for this vest, half sort of eyeballed/half traced a fleece vest i had (wasn't the best idea to use that). It was a bit more complicated since it has a full zip. 2.5 Apex insulation only in the front, with very breathable, non calendared and non DWR 1.1 oz ripstop nylon.
Back is a combo of the above ripstop nylon with no see um mesh for the back. It's designed to be an active piece for colder weather, replacing much heavier fleece, or non breathable puffy type pieces (though not meant to replace camp insulation by any means). Along that line, it weighs only 2.8 oz for a medium size, and could have weighed less had i used a smaller zipper. The idea is that using very breathble fabric, combined with Apex, results is an insulation piece that dries faster and is comfortable in a wider range of temps. Meant to be used in conjunction with a windjacket/shirt, which most of us carry anyways.
Here are some pics. Once i've worked out the kinks (which i largely did from making some mistakes on this project, but still need a bit more practice), i may start selling them for about 40 dollars or so.

Not sure what's going on with the back here (pic below), as it looks fairly symmetrical when off, but i also had my underneath shirt tucked in hastily, and so maybe it was pulling it around a bit.

Weight and scale. Also packs down quite small, though i didn't take a pic fully showing this.


