I have been admiring the JRB down sleeves and now the DIY ones. I got to thinking about picking up a down coat at Goodwill and cutting off the sleeves after running a couple of seams around the shoulder and to the underarm area. Then cutting between the seams and hemming. With cords attached why wouldn't this work? I stopped at a Goodwill and found an EMS jacket with puffy sleeves that fit my arms well. I thought I could use the sleeves and maybe salvage the down out of the body. I have $10.50 in it so far. Any suggestions?