Sewing viscose is mostly about preparation: wash the fabric before cutting (it shrinks by 3 to 5% in the first wash), cut it flat, in a single layer, held down with weights, then stitch it with a fine size 70 microtex needle and a 2 to 2.5 mm straight stitch, pinning generously. Finishes stay light (a rolled hem or a narrow double-turned hem) and the iron goes on a low setting, around 110 to 150 °C, always on the wrong side. With these few moves, this supposedly temperamental fabric becomes one of the most rewarding to wear: fluid, cool, with a crepe-like drape that few cottons can match.
In short: viscose (called rayon in the US) is a man-made fibre made from wood cellulose, most often woven into a light plain weave of 100 to 150 g/m². Soft and with no body of its own, it follows gravity instead of staying put. That is what gives it both its beautiful drape and its reputation as a fabric that "slips" under the scissors and under the presser foot.
Why does viscose slip so much?
Because it has no natural stiffness. Where a cotton poplin keeps its shape on the table, viscose slumps, stretches slightly on the bias and shifts at the slightest touch. Two layers on top of each other slide against one another: that's why cutting "on the fold", so handy with a cotton, becomes a trap here. The bottom layer moves while you cut the top one, and the two halves are no longer symmetrical.
Another quirk: viscose marks easily. A needle that's too thick leaves visible holes, an iron that's too hot leaves a shine. Nothing insurmountable: you just adapt each step, from preparation to pressing.
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Create my made-to-measure patternShould you wash viscose before sewing it?
Yes, every time. Viscose shrinks by 3 to 5% in the first wash, sometimes more in the lighter qualities. A blouse sewn from unwashed fabric can lose half a size in its first trip through the machine: hours of work shrunk in one go.
The right routine: machine wash at 30 °C, delicate cycle, gentle spin (800 rpm maximum), then dry flat or on a hanger, never in the tumble dryer, which makes shrinkage worse. Then press the fabric while it's still slightly damp, on the wrong side: it lies flat again and becomes far more cooperative to cut.
Also allow a little extra when you buy it: between shrinkage and single-layer cutting, count on about 10% more fabric than for an equivalent cotton. Our guide to how much fabric you need works through these calculations width by width.
How to cut slippery fabric like viscose without it moving
This is the step that changes everything. Three principles:
Cut flat, in a single layer
Forget folding it in half. Spread the fabric flat, right side down, across its full width, on a surface with a little grip (a cutting mat, a fleece-backed tablecloth, not a varnished table). Cut each pattern piece once right way up, once flipped over as a mirror image. It takes a little longer, but every piece is accurate.
Weights rather than pins
Place pattern weights (tins, pebbles, metal washers) every 15 to 20 cm on the pattern: they hold without distorting. If you do pin, choose extra-fine pins of 0.4 to 0.5 mm in diameter, placed only in the seam allowances.
Rotary cutter or very sharp scissors
The 45 mm rotary cutter is the tool of choice: the blade slices the fabric without lifting it, so without shifting it. With scissors, keep the lower blade in constant contact with the table and cut in long, clean strokes, never lifting the fabric.
What is the best needle for viscose, and which settings?
The winning trio: a microtex (sharp) needle in size 70/10, good-quality all-purpose polyester thread, and a 2 to 2.5 mm straight stitch. A microtex needle pierces cleanly between the threads instead of pushing them apart; change it as soon as it snags, since a blunt needle pulls threads that can't be rescued on such a fine weave.
A few more settings:
- Slightly reduced thread tension if the seam puckers: test on a folded offcut.
- Pin generously, every 5 to 7 cm, at right angles to the seam: viscose slips away between pins that are too far apart.
- Start the seam 1 cm from the edge, holding the threads towards the back, so the machine doesn't swallow the fabric into the needle plate.
- For openings and necklines, a lightweight fusible interfacing for fine fabrics (applied with a cool iron) stabilises the areas under strain without stiffening them.
And the seam allowances? Viscose frays noticeably. A tight zigzag or your machine's overcast stitch works very well; our article on neatening seams without an overlocker goes through the options, domestic machine included.
Which hem should you choose for viscose?
A heavy hem would ruin the drape: keep it fine and discreet. Two safe bets:
- The narrow double-turned hem: two folds of 0.5 to 1 cm, pressed then stitched close to the edge. Simple, neat, perfect on a blouse or a dress.
- The rolled hem: about 5 mm of fabric rolled, with a hemmer foot or by hand with slip stitch. It's the finish used on scarves and ruffles, the lightest of all.
On a very flared dress hem, let the garment hang for 24 hours on a hanger before hemming: viscose relaxes on the bias, and a hem marked too early would turn out uneven.
What are the classic mistakes with viscose, and how do you avoid them?
| The mistake | What happens | The fix |
|---|---|---|
| Cutting without washing the fabric | The garment shrinks by 3 to 5% in the first wash | Wash at 30 °C, dry flat, press before cutting |
| Cutting on the fold, in a double layer | Asymmetrical pieces, grainline off | Cut flat in a single layer, weights + rotary cutter |
| Universal 90/14 needle | Visible holes, pulled threads along the seams | Microtex 70/10 needle, changed regularly |
| Stitch too long (3 mm or more) | Seams that pucker and lack strength | 2 to 2.5 mm straight stitch, tension tested on an offcut |
| Iron too hot, on the right side | Shiny surface, marks that can't be undone | Low iron (110-150 °C), wrong side of the fabric, pressing cloth |
| Hemming straight after sewing | A hem that ripples after a few wears | Hang for 24 h on a hanger, then hem |
How do you press viscose without making it shine?
Set the iron to silk/synthetic (110 to 150 °C), always on the wrong side, with a fine pressing cloth if you must go over the right side. Press down and lift rather than sliding the iron: warm viscose distorts under an iron that's pushed around. The reward: seams press open beautifully with a gentle iron.
If you're still torn between viscose, cotton or jersey for your next project, our guide to choosing fabric as a beginner helps you match fabric and style. And if one style calls for viscose above all, it's the fluid blouse: few pieces, a drape that shows off the fabric, short seams that are ideal for getting to know it.
FAQ: sewing viscose
Is viscose a good fabric for beginners?
Not for a very first project: a stable cotton is more forgiving. But from your second or third garment, a well-prepared viscose (washed, cut flat, pinned closely) is perfectly manageable.
What's the difference between viscose, rayon and challis?
They are three names from the same family: "rayon" is the North American name for viscose, and "challis" refers to a particularly soft, light weave of this fibre. The sewing advice is the same for all three.
Can I sew viscose on a basic domestic sewing machine?
Yes, without any costly accessories: a microtex 70/10 needle, a well-adjusted straight stitch and a zigzag for neatening are enough. The standard presser foot is fine; a walking foot helps but isn't essential.
Why do my seams pucker on viscose?
Three common causes: thread tension too high, a stitch that's too long, or fabric held back in front of the foot. Lower the tension one step, go down to 2-2.5 mm and guide the fabric without pulling it: the machine should feed it on its own.
Does viscose drop as you wear it?
Slightly, yes, especially on the bias: a flared dress hem can lengthen by 1 to 2 cm in places. Hence the golden rule: let the garment hang for 24 hours on a hanger before marking the final hem.
Your viscose is washed, pressed and ready to cut? All it needs now is a pattern designed for a fluid fabric, drafted directly to your body measurements, with sewing instructions that detail every step. Create my made-to-measure pattern.