Thinsulate is heavy for the amount of warmth, it's good for gloves
One is probably the best insulation per weight, but you have to quilt it - I forget - 8 inches x 8 inches in both directions?
Primaloft Sport is better than Thinsulate, not quite as good as One, requires less quilting, sold by Seattle Fabrics - I might use that
You're going to be more like 8 or 9 ounces for a vest
The liner and fave fabrics are about 1.5 square yards each, total 3 square yards, 3.3 ounces for 1.1 ounce nylon, the lightest SF has, plus One or Sport are 3 oz/yd2 so that's another 4.5 ounces = 8 ounces total. Plus a zipper?