Yellow Bolster Cover, Buy Set of 2 Yellow Cotton Bolster Cover Online- Swayam India
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DIY Pottery Barn Linen Knot Bolster Pillow Cover. I think these would fit better and be easier to clean for the long pillows.
LINEN BOLSTER COVER: Pure Linen Natural Off White by LinumStudio
Intermediate Projects for Growing Sewing Skills Beyond the Basics: Free Directions to Sew a Round Bolster Pillow