What A Tailor Cannot Change, And Why

Tailoring is often treated as though anything can be adjusted. The real limits are structural, and knowing them before buying decides which garments are worth altering.

Alterations move seams, and seams have limits

Taking a garment in means stitching a seam further from the edge. Letting it out means using fabric that was folded inside, and only what was left there is available.

Manufacturers leave different amounts of this seam allowance. Better tailoring leaves generous allowances precisely so the garment can be adjusted; cheap production trims them to save fabric.

This is why the same alteration is possible on one jacket and not on another that looks identical. The answer is inside the garment, not in its price tag.

Shoulders are the hard boundary

On a structured jacket the shoulder contains padding, canvas and a set-in sleeve. Changing its width means removing the sleeve, reshaping the structure and reattaching it.

The work is possible and expensive, often approaching a significant fraction of the garment's value. It also risks changing how the whole jacket hangs.

The practical rule follows: buy a jacket that fits the shoulders and alter everything else. Nothing below the shoulder line presents the same difficulty.

Some changes move a problem rather than solving it

Shortening a jacket alters the balance between the body and the pockets, and cuts into the proportion of the lapel and the button placement.

Slimming a sleeve too much restricts the armhole indirectly, because the sleeve can no longer accommodate movement even though the armhole itself was untouched.

A good tailor will refuse work of this kind or explain the consequence. An alteration that produces a technically correct measurement and a worse garment is still a failure.

Pattern and construction constrain the options

A checked or striped fabric shows any alteration that shifts the pattern across a seam. Taking in a side seam on a bold check moves the alignment visibly.

Fully lined garments require the lining to be opened and reclosed for most work, which adds labour. Bonded, fused or welded seams cannot be opened at all.

Knitwear is the extreme case, because cutting a knitted structure makes it unravel. Most knitwear alteration is limited to length, and even that is specialist work.

The four cheap changes cover most problems

Hemming trousers, shortening sleeves, taking in a waist and slimming a side seam are all routine, quick and inexpensive on nearly any garment.

Between them they resolve the majority of off-the-peg fit complaints, which is why buying to the largest measurement and adjusting downward works so reliably.

The corollary is the useful buying rule. Fit the part that cannot be changed, accept looseness elsewhere, and treat the alteration cost as part of the purchase price.