Heather Blue Plaid Sash Sundress. From the Heather Slub Plaid Collection. Bella Dahl's plaid sundress features soft elastic gathering along the front and back neckline. With a flowy skirt, this style is cinched at the waist with a tie. Square neck, sleeveless, pullover style, waist tie. Fabric - 70% cotton,30% rayon. Machine wash. Made in the USA.