"Corduroy which pre-war was confined to working clothes, hard-wearing sports togs. and children's wear, has taken a new importance in post-war fashion."Corduroy is not a fabric I'd associate with the 40's, but in 1946 this "humble cloth of peasants and artisans" made it's entry in the fashion world that was still very short of good dress materials! My favorite 'almost-40's' blazer here and here is a corduroy one, about 10 years old, which I dyed grey (was originally purple).
above 1946, below 1947 inspiration
source images: AWW through Trove