MAIN FABRIC: Any woven fabric with a bit of weight to it is great. Linen, suiting, twill, denim, canvas. Avoid fabrics that can’t take a press since there is a fair amount of fusible interfacing involved in this project.
LINING FABRIC: Typically you want to line your jacket with something that will easily slide on and off over other fabrics. Anything a little bit slippery would work. Rayon, silk, a cotton with a tight weave.
WOVEN INTERFACING: You want the type that looks like fabric (not the papery kind) and is fusible. The papery kind will work in a pinch but it is worth investing in the woven stuff as it will really give your blazer a nicer feel.
KNIT INTERFACING: This interfacing also looks like fabric but has stretch. It will reinforce the collar and lapel without making them too stiff!