Lining, half lining and unlined: what you are paying for

A lining is not insulation. It is a second garment sewn inside the first, and its job is to let the coat slide on over whatever you are wearing, to hide the construction, and to take the wear that would otherwise happen on the inside face of the outer cloth. A fully lined coat costs more to make than an unlined one because it is close to twice the sewing, and a cheap full lining can be worse than a good partial one. What follows is what each version does, what the fibre on the label means, and the two places a lining fails first.

What the lining is for

Slide. This is the main one and the one people underrate. An unlined sleeve drags on a jumper, pulls it up your forearm and makes a coat feel tight that measures perfectly well. A smooth lining means the coat goes on in one movement.

Hiding the inside. Seam allowances, interfacing, pocket bags and the raw edges of a heavy cloth all live between the shell and the lining. Without one, every seam has to be finished properly, which is more skilled work rather than less, and is why genuinely good unlined tailoring is expensive rather than cheap.

Protecting the shell. The inside face of a wool coat is abraded by your clothes all day. The lining takes that, and the lining is the part designed to be replaced. A coat with a worn out lining and a sound shell is a straightforward repair.

Holding the shape. A lining is cut slightly smaller than the shell with a pleat at the back for movement, and that slight tension is part of what keeps a tailored coat hanging cleanly rather than ballooning.

Full, half, and nothing

Fully lined means lining through the body and down both sleeves to the cuff. This is what you want in outerwear, and a full sleeve lining in particular is not optional in a coat you will put on over knitwear.

Half lined, in a coat, usually means the body is lined to around the waist or across the shoulders and upper back only, with the lower body left as finished shell. The sleeves are almost always still lined, because that is where the lining earns its keep. It saves weight and cost and it is a perfectly sensible choice on a lighter coat.

Unlined means exactly that, and on outerwear it is rare and almost always a lighter weight piece: a summer mac, an unstructured overshirt. The seams should be bound or taped. If they are overlocked and raw, the maker has saved money rather than made a decision.

The thing to check is not which of the three a coat is, but whether the sleeves are lined. A body-lined coat with unlined sleeves is a coat that fights you every time you put it on.

Reading the fibre on the label

Viscose, also sold as rayon or by the trade name Bemberg, is the traditional lining fibre. It is cool against the skin, it breathes, it drapes well and it is the most pleasant to wear. It is also weaker than polyester, especially when wet, and it is the lining that tears at the armhole first.

Polyester is stronger, cheaper and lasts longer, and it is warmer and clammier in use because it does not breathe. In a winter coat this matters much less than in a jacket, which is why polyester linings in outerwear are not the compromise they are in tailoring.

Acetate is the one to be wary of. It is cheap, it has a nice sheen, and it is weak, it marks with water, and it splits along the grain. A coat lined in acetate will usually need relining before the shell is tired.

Cupro and silk exist at the top end. Both are very pleasant and neither has any business in a coat you will wear in the rain.

Where a lining fails

The underarm, every time. It is the point of greatest movement and greatest moisture, and viscose and acetate both give way there. The failure looks like a split along the seam or a thin worn patch rather than a hole.

The second place is the lower edge of a coat lining at the vent or the hem, where it catches on a bag, a seatbelt or a chair. A loose hanging lining at the hem is a five minute repair if you catch it and a long one if you do not.

Both are mendable and neither is a reason to retire a coat. Any alterations tailor will replace a lining, and the cost is mostly labour: expect it to run a meaningful fraction of a mid priced coat's purchase price, which is why it is only worth doing on a shell you actually like.

The lining is also the part that tells you the coat has been looked after. When you are storing a coat between seasons, checking the lining at the armhole takes a second and catches the split before it gets long.

What a lining does not do

It does not keep you warm. A standard lining is a thin woven fabric a fraction of a millimetre thick, and it adds no insulation worth measuring. What makes a coat warm is the weight and construction of the shell cloth, any interlining or wadding between the layers, and how well it blocks wind.

Those interlinings are a separate thing and they are often not mentioned on a label at all. A quilted inner panel, a brushed flannel interlining or a layer of wadding is what makes a coat genuinely warm, and a listing that mentions only a polyester lining is not telling you whether any of that is there.

So if warmth is the question, read the shell composition and the weight rather than the lining. The piece on reading a wool composition label goes through what those numbers mean.

What to ask when the listing does not say

Ask three things: are the sleeves lined, what the lining fibre is, and whether there is any interlining or wadding between the shell and the lining. Most listings answer none of those and most sellers can find out.

We will go and read whatever the supplier has documented for a specific coat rather than describing a lining we have not confirmed. On The Suit Trench, The Oversized Long Coat, The Belted Trench and The Patent Trench, the honest position is that we would rather tell you the supplier's own figure than put a guess on a product page, so ask before ordering if the construction is what decides it for you.

One thing you can judge from photographs: look for a hanging loop at the back of the neck and a vent at the lining hem. Both are small signals that the inside was built rather than assembled, and neither costs the maker much, which is exactly why the cheapest coats leave them out.

Questions people actually ask

Does a coat lining make it warmer?

Barely. A standard lining is a thin woven fabric that adds no measurable insulation. Warmth comes from the shell cloth's weight, any interlining or wadding, and how well the coat blocks wind.

What does half lined mean on a coat?

Usually that the body is lined across the shoulders and upper back, or down to about the waist, with the lower shell left finished but unlined. The sleeves are normally still lined, and that is the part that matters most.

Is a viscose lining better than polyester?

More pleasant to wear, less durable. Viscose breathes and feels cool, but it is weak when damp and splits at the underarm first. Polyester lasts longer and feels clammier, which matters less in a winter coat than in a jacket.

Is it worth replacing a coat lining?

If you like the shell, yes. Any alterations tailor will do it, and the shell is the expensive part. The cost is mostly labour, so it is a sensible repair on a coat you intend to keep and a poor one on a coat you do not.