I don't know if it's just me but the hand of these fabrics always reminds me of denim, and I love to sew with denim. I like to wear denim too !! I never find it too crisp, and it softens up a treat with washing.
Luckily for Hyacinth, these dresses are yet to be made, and so far only exist in my imagination !! She doesn't need to hide the key to her wardrobe.