I know I can use the search option, but I was hoping that asking about specific materials and construction might help get me pointed in the right direction a little faster.
First off, I'm more inclined to take on the project after buying an REI branded Pertex jacket with primaloft on clearance. I forget the name of it. Cedar run or something? Anyhow, I bought it in the dead of winter realizing that I actually didn't have a jacket. I kept remarking how the thing was like wearing my own personal sleeping bag. It was great out in 20 degree weather with a 5 degree windchill, and still fine indoors. I took it on a recent car camping trips with friends during cool to warm temps just in case it got chilly at night. I ended up napping with the thing draped over me in the middle of the day and realized how awesome it was for the conditions, which were probably in the mid to high 70's.
So, with all that said, from the info I've gathered so far, I think I'm targeting a project using the momentum90 fabric and primaloft insulation from thru-hiker.com. The idea is to make a quilt that will be good for summer, but work down to maybe 20 degrees when used in conjunction with my primaloft jacket that I will be carrying/wearing anyway in the winter. So with that in mind, which weight of primaloft insulation should I be using? Right now I see it in .4, .6, and 1.2 inch lofts. What is the conventional wisdom for loft of primaloft in regards to degree rating?
Also, I really have zero idea what to start with pattern wise. I've seen some with the closed footbox and open back that can be tied together for winter. That seems like a good way to go. Although I'd also like an option to cinch down the top over my shoulders in colder weather. Any ideas?