If there is one fabric that feels like a warm hug, it is flannel. Flannel is the soft, lightly fuzzy cloth behind your favorite winter pajamas, the cabin shirt your husband refuses to retire, and the cosiest baby blankets you will ever wrap a newborn in. In this guide I want to walk you through exactly what flannel is, how it is made, the difference between cotton and wool versions, how to care for it, and the projects where it truly shines. By the end you will know how to choose it, prewash it, and sew it without the fuzz getting the better of you.
What Is Flannel?
Flannel is not a single fiber, it is a finish. It is a soft woven fabric that has been brushed on one or both sides to raise a fine layer of fibers called the nap. That brushed nap is what traps air against your skin and makes flannel feel so warm and soft. The base cloth is usually a plain weave or a gentle twill, and the brushing is done with fine metal bristles that tease the loose fiber ends up to the surface.
Because flannel is defined by the brushing rather than the fiber, you will find it made from several materials. Traditional flannel was wool. Today most of the flannel a home sewist buys is cotton or a cotton blend, prized for being washable and gentle against the skin. You will also see synthetic micro fleece sold as flannel, though purists would call that something else entirely.
A quick way to recognise good flannel by touch: run your hand across the surface and you should feel a faint resistance, like brushing a peach, rather than a slick flat weave. Hold it to the light and the weave looks slightly soft and out of focus because of all those raised fibers. That hazy look is exactly what you want.
Flannel Vs Fleece And Other Cosy Fabrics
People often lump flannel in with fleece, but they are quite different. Fleece is a knit, usually polyester, with a thick plush pile, no woven grain, and edges that do not fray. Flannel is woven, so it has a clear straight grain, it frays when cut, and it presses crisply. Fleece is warmer and bulkier; flannel is lighter, breathes better, and behaves like a normal woven fabric at the machine. If you have read our guide to warp and weft, flannel is simply a standard over and under weave with a brushed finish on top.
Flannel also gets confused with brushed cotton and with twill shirtings like poplin. The simple rule: if it is brushed and fuzzy, it is flannel; if it is smooth and crisp, it is not. Compared to a yarn dyed check like gingham, flannel is softer and warmer but handles in much the same friendly way.
Why Is It Called Flannel?
The name almost certainly comes from Wales. The Welsh word gwlanen, meaning a woolen article or a piece of woolen cloth, is the most widely accepted root, and it makes sense: Wales had a thriving woolen flannel industry from the 16th and 17th centuries onward. The word travelled into English and then into French as flanelle, and from there spread across Europe. So every time you say flannel you are nodding to centuries of Welsh wool weaving.
A Brief History Of Flannel
Flannel began as a hard wearing wool cloth for working people in Wales, valued because the brushed wool kept laborers warm in a cold, damp climate. Through the 18th and 19th centuries it spread across Britain and then the world. Soldiers wore wool flannel, Victorians wrapped babies and invalids in it, and it became a staple of underclothing because it was warm yet breathable.
The big shift came with industrial cotton spinning, which made soft, affordable cotton flannel possible. In North America cotton flannel became the fabric of the frontier and the logging camp, which is where the classic red and black buffalo check shirt was born. By the 20th century flannel had two faces: the rugged plaid work shirt, and the refined grey wool flannel of a tailored suit. Both are still going strong today.
How Is Flannel Made?
Making flannel happens in two stages. First the cloth is woven, usually as a simple plain weave or a soft twill, from loosely spun, slightly fuzzy yarns. Loosely spun yarn matters, because tight, hard yarn will not brush up well. Then comes the part that turns ordinary cloth into flannel: napping.
In napping, the woven fabric is passed over rotating cylinders covered in fine wire brushes, which catch and lift the short fiber ends out of the yarn to create that raised, fuzzy nap. The cloth can be brushed on one side, called single nap, or on both sides, called double nap. Double nap flannel is warmer, denser, and the better choice for blankets and cold weather pajamas. After brushing, the surface is sometimes lightly sheared to even it out.
Plaid flannels are usually yarn dyed, meaning the threads are dyed before weaving so the check runs all the way through the cloth and looks the same front and back. That is the mark of quality flannel, as opposed to a pattern simply printed onto a white base.
How To Care For Flannel
Flannel is easy to live with as long as you respect two things: it shrinks, and the nap can pill. Here is how I keep mine looking good for years.
- Always prewash cotton flannel before cutting. It can shrink noticeably, sometimes more along the length, so wash and dry it the way you plan to launder the finished item.
- Wash in cool or warm water on a gentle cycle. Hot water and harsh agitation rough up the nap and cause pilling.
- Skip the fabric softener and dryer sheets. They coat the fibers and flatten the soft nap over time. A wool dryer ball is kinder.
- Tumble dry low or line dry. Over drying is the fastest way to a stiff, pilled finish.
- For wool flannel, follow the care label: many wool flannels are dry clean only or need gentle hand washing.
A little pilling on well loved flannel is normal. A fabric shaver brings it back to life in minutes.
Best Sewing Projects Using Flannel
Flannel is forgiving, cosy, and endlessly useful, which makes it a joy for so many projects. Here are the ones I reach for it again and again.
Rag quilts and baby blankets. Flannel was made for this. Its softness and the way the brushed edges fray into fluffy seams is exactly why it is the classic rag quilt fabric. If you have never made one, our step by step rag quilt tutorial is the perfect place to start, and it looks wonderful in cosy plaids.
Pajamas and loungewear. Soft, breathable, and warm without being heavy, flannel is the obvious choice for winter sleepwear. A pair of simple elastic waist bottoms in a good double nap flannel will be the most worn thing you sew all winter.
Cosy shirts and shirt dresses. The classic plaid flannel shirt never goes out of style, and a soft flannel shirt dress is wonderful for fall. Cut it with a relaxed fit and a clean yoke.
Small cosy accessories. Flannel is lovely for an oversized sleep mask, soft scrunchies, or a quick headband. These little makes are a great way to use up the leftover strips from a bigger flannel project.
For supplies, a good rotary cutter and self-healing mat make cutting flannel layers far easier, and a pack of sewing clips helps hold the bulky, shifty layers together better than pins. A walking foot is worth its weight in gold when you are quilting thick flannel.
Tips For Sewing With Flannel
Tip 1: Prewash, Then Prewash Again
Cotton flannel shrinks, and it can keep shrinking on the second wash. For anything that needs to hold its size, like a quilt, wash and dry it twice before you cut. It feels excessive, but it saves heartbreak later.
Tip 2: Mind The Nap And The Grain
Flannel has a soft direction. Cut all your pieces with the nap running the same way, usually downward, so the color and sheen match across the finished item. Keep everything on the straight grain too, since the soft weave can distort easily if you cut carelessly.
Tip 3: Lengthen Your Stitch And Reduce Bulk
Flannel is lofty, so a slightly longer stitch, around 3.0 mm, sits better than a tiny one. Press seams open or grade them to cut down the bulk, especially where several brushed layers meet.
Tip 4: Tame The Fuzz
Flannel sheds fuzzy lint as you sew. Clean out your bobbin area and change your needle more often than usual, and keep a lint brush handy. A fresh universal 80/12 needle gives the cleanest stitches.
Tip 5: Stay Stitch And Handle Gently
Because the soft weave stretches off grain, staystitch curved edges like necklines before you handle them, and resist tugging the fabric through the machine. Let the feed dogs do the work.
Ready To Sew Something Cosy?
Flannel rewards a little patience with years of softness and warmth. Whether you are wrapping a new baby, sewing winter pajamas, or making your first rag quilt, it is one of the friendliest fabrics you can choose. If you want to keep exploring, browse our free sewing patterns for a cosy project to put your flannel to work, and have a look at our other fabric guides below.
Related reading: What Is Velvet, What Is Seersucker, and What Is Challis Fabric.
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