Eons ago I made a wool coat to wear at college, and used an interlining between the wool and satin lining. It was one of my few ventures into tailoring, and included bound buttonholes. Now that coat is gone, but not forgotten!
These days, I’d use an interlining of Thinsulate™, made by 3M™. It’s listed on-line at The Green Pepper, The Rain Shed (both Oregon), and Vogue Fabrics (Chicago). That’s not to say there aren’t equivalents elsewhere; just that I don’t know about them.
“3M™ Thinsulate™ Insulation is used in jackets‚ pants‚ gloves‚ hats and boots to help keep you warm when it’s cold outside. The unique microfibers or fine fibers that make up Thinsulate insulation work by trapping air molecules between you and the outside. The more air a material traps in a given space‚ the better it insulates you from the cold outside air. Because the fibers in Thinsulate insulation are finer than the fibers used in most other synthetic or natural insulation‚ they trap more air in less space‚ which naturally makes Thinsulate insulation a better insulator.” (from their site)
Note: Everywhere it says Do Not Pretreat this insulation! It’s washable & dry cleanable, but not until its sewn between fabrics, as an interlining.
Green Pepper and Rain Shed also list different weights of Polartec® fleece, which I much prefer to any other fleece I’ve gotten from fabric stores. Green Pepper’s selection is limited, so you should call or email for current stock.
Have a warmth of winter sewing!
Original WordPress post here.
More warmth here.