What This Fabric Is
The White Optic Muslin Cotton Wideback Fabric, sold by the yard at Linda's Electric Quilters, is a cotton muslin backing made by Moda Fabrics — and it is wider than most widebacks. Where a standard wideback measures 108 inches, this muslin measures 120 inches wide, in a clean, bright white optic shade and a 200 thread count cotton. Muslin is the plain, breathable, even weave quilters have relied on for generations, and in this extra-wide format it does the job it is best at — covering the back of a quilt in one smooth, seamless piece — for even the largest tops.
The description also notes what makes muslin so versatile beyond backing: it is breathable and comfortable, works for quilting, home décor, and apparel, and its wide cut reduces the need for seams, giving a smooth, impeccable finish. As a backing, that clean white is a neutral foundation that will not compete with the quilt top or fight with your binding choice.
How to Choose a Backing: Start With the Size Math
Use the standard rule before you order: your backing should measure your quilt top plus 8 inches in both directions — 4 extra inches on every side. That overhang gives a longarm quilter room to load, clamp, and advance the quilt, and gives a home quilter room to baste securely and quilt right out to the edges without running short.
Now run the numbers against a 120-inch width — this is where this fabric earns its keep. Tops up to 112 inches wide fit in a single width with no piecing, wider than the 100-inch ceiling of a 108-inch backing. A 60 by 72 inch throw needs a 68 by 80 inch backing: one width covers the 68-inch side, and 80 inches of length is just over 2-1/4 yards. A 90 by 100 inch quilt needs 98 by 108 inches — inside one width, at exactly 3 yards. Even a 104 by 112 inch king top needs 112 by 120 inches, which still fits the width, at 3-1/3 yards. To order, take the longer backing dimension, divide by 36, and round up. Muslin has no directional print, so you never need extra yardage to match a motif.
Cotton vs. Minky vs. Flannel
Cotton wideback is the stable, breathable, all-purpose choice: it presses crisply, does not stretch, and feeds evenly — and cotton muslin is its lightest, most straightforward form, adding coverage without weight or bulk. Flannel is brushed cotton — warmer and cozier, but grippier and with more shrinkage to plan for. Minky is plush polyester — warm and drapier, but typically narrower than this 120-inch width and stretchier to handle. Choose this White Optic muslin when you want the widest seamless coverage available and a backing that behaves predictably on the frame or under the needle.
Working Tips: Folds, Washing, and Loading
Pressing the fold: Wideback yardage arrives folded, and cotton remembers that crease. Unfold it fully, then press with a warm iron from the center outward. For a stubborn center fold, a light spritz of water or steam and a second pass usually settles it — a crease left in the backing can quilt in permanently.
Prewashing: Cotton can shrink slightly, so many quilters prewash muslin before use. If you prewash the backing, wash the top fabrics the same way so everything shrinks together. If you skip it, expect a soft, slightly crinkled texture after the first wash of the finished quilt — a look many quilters love.
Longarm loading: Check that the backing is square before loading, keep the selvages even, and load it so the 120-inch width runs across the frame. Smooth, even tension matters more than tight tension, especially with a lighter muslin weave.
Care
For the finished quilt, wash in cool to warm water on a gentle cycle and tumble dry low or line dry. Cotton muslin softens with washing while keeping its structure, and the white optic shade stays brightest washed with like colors.
Shop the White Optic Muslin Cotton Wideback Fabric per yard at Linda's Electric Quilters.
