Originally Posted by
Schneiderlein
The thru-hiker Whitney in size medium comes with 5.2 oz of down. I made mine a good bit longer in the torso and lengthened the sleeves a bit and ended up using 5.8oz of down (the additional down was from the group buy). It is a toasty warm jacket, but since you just started sewing, I would recommend to make the quilts first before trying to sew the jacket. And then, maybe practice on some other clothing items first.
The top quilt I was using at the Congaree swamp hangout had about 7.5oz of Speer down in it, IIRC. I've found it comfortable to the mid-twenties. As an underquilt, I don't think I could go much below 40 with it, unless I double it over and use as a 1/2 UQ. 12 oz of down for a full-length UQ will probably do you just fine for 3-season South Carolina backpacking, and by that I mean Fall, Winter and Spring!
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