Loungewear Manufacturing: Fabric Weights, Set Matching and Shrinkage
Loungewear is deceptively hard to manufacture well. There is no complex construction to get right — most of it is simple shapes in soft knits — which is exactly why the things that go wrong go wrong in the fabric and the finishing rather than in the sewing.
Three failures account for most disappointing loungewear samples: the fabric is lighter than the brand pictured, the top and bottom of a set do not quite match, and the whole thing shrinks unevenly in the first wash. All three are avoidable, and all three are decided before a single garment is cut.
Fabric: what loungewear is actually made from
Four families cover nearly everything in this category, and they feel entirely different on the body.
| Fabric | Hand-feel | Typical use | Notes |
|---|---|---|---|
| Brushed-back fleece | Soft, substantial, warm | Hoodies, joggers, matching sets | The inside is brushed to raise a nap; the loft is what makes it feel expensive |
| French terry | Smooth face, looped back, mid-weight | Year-round sets, sweat shorts | Lighter and more breathable than fleece; drapes rather than holds shape |
| Modal and cotton-modal | Fluid, cool, high sheen | Sleep sets, robes, wide-leg trousers | Drapes beautifully, resists pilling better than cotton, takes dye deeply |
| Ribbed knit | Stretchy, close, textured | Ribbed sets, cropped tops, leggings | Recovery matters more than weight; a rib that stretches out is the common fault |
Weight, and why 'heavyweight' means nothing on its own
GSM — grams per square metre — is the only honest way to specify weight. “Heavyweight” is a marketing word and two suppliers will not mean the same thing by it.
For brushed-back fleece loungewear, 280–340 GSM is the range that reads as substantial and cosy without becoming a gym sweat. Below about 260 the garment starts to feel thin and the brushed back flattens quickly with washing. Above roughly 380 you are into heavyweight streetwear territory, which is a legitimate choice but a different product and a noticeably warmer one.
French terry for the same silhouettes usually sits lower, and modal sets lower again — those fabrics are chosen for drape, and loading them with weight defeats the point. Specify the number, get it confirmed on the sample, and check it rather than trusting the label. Our GSM converter handles the translation if your reference is in ounces.
The set-matching problem
This is the one that catches new brands. You order a matching hoodie and jogger in the same colour, the sample arrives, and the two pieces are almost — but not quite — the same shade. In daylight it is obvious. Photographed for a product page it is worse, because the camera exaggerates it.
The cause is dye lots. Fabric is dyed in batches, and two batches of the same approved colour can differ slightly. If the hoodie fabric and the jogger fabric came from different lots, they will not be identical, no matter how carefully the colour was specified.
The fix is procedural rather than technical: cut the top and the bottom of a set from the same dye lot. It has to be planned at fabric booking, because once two lots have been knitted and dyed you cannot make them match retrospectively. We treat this as standard on sets rather than as an upgrade, because a set that does not match is not really a set.
One thing to be clear about: the dyeing itself happens at partner mills. We write the specification, place the order and inspect those plants, but we do not own them. What we control is the instruction — that a set is booked as one lot — and the check on the way in.
Shrinkage, and the first-wash problem
Knitted fabric comes off the machine under tension. Left alone, it relaxes when it is washed, and the garment shrinks — usually more in length than in width, which is why a jogger can come back shorter but no slimmer.
Two things prevent it, and they happen before cutting:
- Compacting. The fabric is mechanically shrunk under controlled conditions so that most of the movement happens at the mill rather than in the customer’s machine.
- Relaxed cutting. The fabric is spread and left to settle before the cutter goes near it, so it is cut in the state it actually wants to be in rather than stretched flat.
Neither is exotic and both are skippable, which is precisely why you should ask. The verification is simple and worth insisting on: request a wash-tested sample — a garment that has been through a domestic wash cycle and measured before and after. A supplier confident in their finishing will not mind. One who hesitates has told you something.
Fit: relaxed is a specification, not an absence of one
Loungewear is cut loose, which tempts brands to be vague about measurements. That is a mistake, because “relaxed” without numbers means the factory picks, and the factory’s idea of relaxed may not be yours.
Specify the finished garment measurements you want — chest, body length, sleeve, inseam, leg opening — and agree the tolerance. Pay particular attention to rib recovery at cuffs, hems and waistbands. A rib that stretches and does not spring back is the single most common reason loungewear looks tired after a month, and it is a function of the rib specification and the elastane content, not of how the garment was sewn.
A sensible first run
Loungewear is a good category to start small in, because a set is two garments and your minimum applies to each style and each colour separately. Two styles in two colours is four style-colour combinations, not two — a distinction that surprises people at quotation stage. Our MOQ calculator works that out if you want to see the number before you ask.
The practical advice is to launch narrow: one fabric, one or two colourways, two silhouettes that genuinely belong together. Range width is the expensive kind of ambition in a category where the whole proposition is that the pieces match.
For fabrics, weights and what we make in this category, see our loungewear manufacturing page.
Frequently asked questions
What GSM should loungewear be?
For brushed-back fleece, 280 to 340 GSM is the range that reads as substantial and cosy without becoming a gym sweatshirt. Below roughly 260 GSM the garment feels thin and the brushed back flattens quickly with washing. Above about 380 you are into heavyweight streetwear, which is a valid choice but a different and noticeably warmer product. French terry for the same silhouettes usually sits lower, and modal or cotton-modal sets lower again, because those fabrics are chosen for drape and loading them with weight defeats the purpose. The important thing is to specify the number rather than a word. Heavyweight is a marketing term and two suppliers will not mean the same thing by it, so put the GSM in writing and verify it on the sample. If your reference point is an existing garment you like, have it weighed rather than guessed at, and specify from that number instead of from a description.
Why do the top and bottom of my matching set look slightly different?
Almost always dye lots. Fabric is dyed in batches, and two batches of the same approved colour can differ slightly even when both are within tolerance. If the hoodie fabric and the jogger fabric came from different lots, they will not be identical, however carefully the colour was specified. Daylight makes it obvious and photography makes it worse, because a camera exaggerates small shifts in shade. The fix has to happen at fabric booking rather than afterwards: the top and the bottom of a set are cut from the same dye lot. Once two lots have been knitted and dyed, nothing can make them match retrospectively. Ask any supplier quoting on sets whether same-lot cutting is standard or an upgrade. It is worth settling in writing before sampling, because a set that does not match is not really a set, and the failure only becomes visible once both pieces are finished.
How do I stop loungewear shrinking in the first wash?
Knitted fabric leaves the machine under tension and relaxes when washed, which is why a jogger often comes back shorter but no slimmer. Two processes prevent it and both happen before cutting. Compacting mechanically shrinks the fabric under controlled conditions so the movement happens at the mill instead of in the customer's machine. Relaxed cutting means the fabric is spread and left to settle before it is cut, so it is cut in the state it wants to be in rather than stretched flat. Neither is exotic and both can be skipped to save time, which is exactly why you should ask. The verification is straightforward: request a wash-tested sample, measured before and after a domestic cycle. A confident supplier will not object. Agree in advance what movement you will accept, since a small percentage is normal in knitwear and a specification claiming zero shrinkage is not a promise anyone can keep.
Does a matching set count as one product or two for minimum order quantity?
Two, and this surprises people at quotation stage. A minimum applies per style and per colour, so a hoodie and a jogger are two separate styles even when they are sold together as one set. Two silhouettes in two colourways is therefore four style-colour combinations rather than two, and the minimum applies to each. The reason is production rather than pricing policy: each style needs its own pattern, its own marker and its own cutting and sewing setup, and each colour needs its own fabric booking. The practical implication is to launch narrow. One fabric, one or two colourways and two silhouettes that genuinely belong together will cost far less than a wide range and is a better test of whether the set works. Range width is the expensive kind of ambition in a category whose entire proposition is that the pieces belong together, and it is easily added once the first run has sold.
Where this applies
The manufacturing pages this guide relates to, if you are costing a real run.
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