The short answer from most review threads: usually not pure cashmere. Reviewers tend to describe these as wool–cashmere blends or plain wool, even when the label says 100%. A composition label on a replica is just another printed detail. It isn’t a lab certificate.
It works as a clue, not as proof. A composition label (the one giving the fibre percentages) is just as easy to print with one number as with another.
What about the burn test? I see it suggested every time.
It’s useful, but it has an important limit. The burn test (burning a loose strand from an inside seam) tells animal fibre from synthetic fibre:
- Animal fibre: burns slowly, smells of burnt hair and leaves an ash that crumbles.
- Synthetic: melts into a hard little bead and smells of plastic.
But it can’t tell cashmere from wool: both are animal fibres.
And watch out for safety: a single fibre, pulled from an inside seam, over a sink, never on the jumper itself. And an “animal” result still doesn’t prove it’s cashmere.
OK, but then what’s left? If neither the label nor the burn test proves it, you’re basically buying blind.
Practical summary, from most reliable to least:
1. What proves NOTHING
- The composition label: just another printed detail.
- QC photos: cashmere can’t be told from good wool in a photo.
2. Burn test (carefully)
- It only tells you animal vs synthetic.
- If it comes out synthetic → the “100% cashmere” is false.
- If it comes out animal → it could be cashmere, wool or a blend.
3. Feel and look (compared with a reference)
- Cashmere is very soft, light for its warmth and has a fluid drape (how the fabric falls on the body).
- A coarser wool is itchier, stiffer and has less “bounce”.
If you have a garment like this, post a close-up of the knit in raking light: it clearly shows how fine the fibre is and how dense the knit.
4. Wear
- Short fibres pill sooner. A little pilling in areas of friction is normal even on genuine cashmere, so it doesn’t prove anything either way.
Conclusion: a replica can be a lovely garment, but it’s best chosen for how it feels and how it fits you, not for what the label says.
Care tip: hand wash in cold water with a gentle shampoo and dry flat on a towel, never hung up.
Crystal clear, thank you! I’ll go with the drape and the feel. 
A sober answer to a question usually met with wishful thinking. Well put.