Pocketing: why the hardest-worked part of a garment needs its own cloth

The pocket is the hardest-worked part of a garment

Think how many times a hand goes into a trouser pocket over the life of the garment. Dozens of times a day, for years. The same surface rubs every time.

And what goes into a pocket is not kind to cloth: keys, loose change, the corner of a phone. On top of the rubbing, those cause point wear.

Then there is this: when a pocket goes through, the garment is not unusable — but it feels unusable. A pair of trousers with a perfectly good outer cloth gets set aside because the pocket has a hole. Pocketing is a part nobody sees that decides the life of the garment directly.

If you want to know where a garment will die, look at the pocket. The outer cloth rarely gives out; the pocket bag usually goes first.

What a pocket bag cloth has to be

Pocketing sits at the crossing of demands that pull against each other. It has to be four things at once:

• Hard-wearing. It has to resist both rubbing and point wear.
• Thin. A pocket bag sits doubled inside the front of a pair of trousers; a thick cloth reads as bulk from outside.
• Dimensionally stable. It must not shrink in the wash — the reason is set out separately below.
• Easy to sew. A pocket bag is a curved, closed seam; a difficult cloth slows production here.

The first two work against each other: strength usually comes with thickness, and thickness is exactly what is not wanted. Pocketing exists as a separate cloth to balance those two — an ordinary woven or a lining is not expected to hold that balance.

Why lining tires in a pocket

Making pocket bags from lining is common and understandable: the lining is already there and it is thin. But a lining is designed for a different job.

Polyester lining and satin lining exist to reduce friction — so the garment is easy to put on. A slippery face escapes friction; pocketing has to live inside it.

The upshot: a pocket bag made from lining works, but it finishes before the garment does. A choice that looks cheap comes back as a shorter product life. Satin lining is a particularly poor choice — its long floats snag on keys and fingernails.

A shrinking pocket bag ruins the outside

Why does "does not shrink in the wash" matter so much in pocketing? The answer lies in where a pocket bag is sewn.

The bag is fixed to the trouser front, at the waist and the side seam. It is attached to the outer cloth. When the bag shrinks in the wash, it pulls the front upwards and inwards from inside.

What you see from outside is a pucker or a drag line across the trouser front, at pocket level. The customer takes it for a fault in the outer fabric — when the problem is in a part nobody can see.

• Choose a pocketing that can be washed with the outer cloth; their shrinkage rates should be close.
• Starting on a new fabric, wash and measure the pocketing separately.
• Do not sew the bag under tension; a little ease absorbs the shrinkage allowance.
• Be careful pairing a cotton-rich outer cloth with a polyester pocketing — the two behave differently in the wash.

This is one of the latest faults to be noticed in production: the prototype is fine and it is wrong after the first wash. Sewing one pocket bag and washing it takes five minutes and saves the batch.

Colour: the visible side of an invisible part

A pocket bag is not seen — except that it is. It shows in two situations:

• In thin, pale trousers the bag reads as a shadow from outside. A dark pocketing shows through pale linen trousers.
• The inside is visible through the pocket opening. Anybody looking into the pocket sees the cloth, and a crude colour mismatch reads as carelessness.

This is why pocketing is generally kept in neutral tones: white, off-white, grey, beige, black, navy. We hold 10 – 15 base colours — in practice enough to sit under any outer fabric tone.

Making the pocket bag

A pocket bag is a closed volume, and that decides the seam choice directly. A cut edge left open inside is exposed to constant contact with a hand.

• Do not leave the cut edge open inside. Overlock it, or use a closed seam such as a French seam.
• Reinforce both ends of the pocket opening. That is where the bag tears; a bar tack or extra stitching goes there.
• Put Terfix tape along the pocket opening. It is a line under constant pull and it stretches.
• Round the bottom corners of the bag. Dust and coins collect in a sharp corner, and the stitching is strained there too.
• Fix the bag to the side seam; a loose bag turns around inside the trousers.

The pocket opening deserves separate attention: a trouser pocket mouth is cut on a curve, and every edge cut off the straight stretches. Without a tape the opening gapes within a few months and the trousers look wrong through the hip.

At the machine

• Needle: 70/10 – 80/12, sharp point.
• Stitch length: 2 – 2.5 mm. Dense stitching on a pocket bag adds strength.
• Thread: polyester. The pocket seam is among the most strained in a garment.
• Do not force the cloth on the curves; pocketing works easily and takes a curve on its own.
• Check the seam allowance before turning the bag; a leftover allowance creates friction inside.

Common mistakes

• Making pocket bags from lining. It finishes before the garment; satin lining is particularly poor.
• Skipping the shrinkage test. A shrinking bag puckers the outside and is blamed on the outer fabric.
• Not taping the pocket opening. A curved opening gapes within a few months.
• Leaving the cut edge open inside. It frays under constant contact.
• Using a dark pocketing in thin, pale trousers. It reads as a shadow from outside.

When you order

200-metre rolls, in 10 – 15 base colours. A long roll cuts the number of roll changes on work like pocket bags, where many small pieces are cut.

Tell us your outer fabric. Pocketing is not chosen on its own but against the outer cloth, particularly on shrinkage.

For colour, bring a piece of the trouser fabric; in thin, pale cloths the pocketing can show through.

Samples, stock and delivery are settled on the phone.