The most fabulous collection of vintage-inspired tulips. Drawn exclusively for Brook Isle by American artist Rachel Caldwell. Classically sized at 18x28. About flour sack cotton: During 19th and early 20th centuries, basic cooking ingredients like flour and salt were traded in large sacks made of 100% cotton. The finest cotton was chosen for its durability and heavily knitted using a diagonal method, making it easier for the fabric to dry. It didn’t take long for people to realize that this fabulous fabric could be used for dish towels, pillow cases, and hand towels.