Neck-



Shoulder-

Center back-

Side seam-

Hem-

Armhole-

Side seam-

Front seam-

Hem-

Neck-

Shoulder-

Side seam-

Hem-

Lapel and front edge-

Hem

Inseam, elbow seam



Vent

Hem-

Inseam

Elbow seam-

Waist-



Outseam-

Inseam-

Words and Illustrations by Jeffery DiduchAlterations are a fact of life when buying tailored clothing. No two bodies are alike and so allowances are given so that a garment can be altered to fit better. Likewise, bespoke garments will also have allowances built in to allow for changes in weight over the life of a garment. The types of allowances, or inlays, will vary whether the garment was ready-made or tailor-made and so the types of alterations possible will also vary. We will look in-depth at the allowances given for garment alterations. The illustrations show typical seam and inlay allowances- where bespoke differs from ready-made, the extra is shown shaded in grey; exact amounts vary from cutter to cutter so no detail has been given. Keep in mind that the minimum seam allowance recommended is ¼” so when looking at an allowance of 1”, for example, you have ¾” left to let out. Also keep in mind that were are discussing one half of the garment so allowances should be doubled in most cases i.e. if we can let the waist out 1/2” at a certain place, it gives a total circumference of 1” to let out.Manufacturers vary slightly on the allowances on the neck, center back and side seam.there may be only 3/8”, but better makers will have 5/8” allowing the collar to be raised up to 3/8”.There is no allowance for changes to the shoulder width- it can be narrowed but not widened. Bespoke will generally have an allowance for widening here. The shoulder can be sloped or squared (squaring will shorten the garment slightly).between 5/8” and 7/8” is typical- bespoke cutters may leave more here.Total to let out- ¾” to 1 ¼”between 5/8” and 7/8” (bespoke may have less here)Total to let out here- ¾” to 1 ¼”Generally 1 1/8” to 1 ¼”. Bespoke may have more. We will see that in most cases this does not allow the garment to be lengthened, but does give us some wiggle room for passing up the back for a stooped figure.Ready-made has only a small allowance for changes at the side seam. Bespoke generally has a generous allowance to either increase or decrease the width of the armhole. The armhole CAN NOT be raised without altering the length of the jacket and the position of the gorge and the pockets. While not strictly impossible, raising the armhole should not be attempted on a finished garment.Between 5/8” and 7/8”. Bespoke will have considerably more.Total to let out here- ¾” to 1 ¼”Generally 5/16” or 3/8”- no room to let out here. The pocket will intersect this seam so in most cases it must be dismantled and remade in order to take in this seam here- this is difficult and costly.Generally 1 1/8” to 1 ¼”. Bespoke may have more.There may be only 3/8”, but better makers will have 5/8” allowing the collar to be raised up to 3/8”.There is no allowance for altering the shoulder in ready-made garments, other than to narrow it, slope it, and, to a small extent, to square it. Bespoke generally has an allowance to drop the front (for a longer front balance) and to widen the shoulder. Crookening and straightening the shoulder (to a small extent) is also possible in bespoke garments.Generally 5/16” or 3/8”- no room to let out here. The pocket will intersect this seam so in most cases it must be dismantled and remade in order to take in this seam here- this is difficult and costly.Generally 1 1/8” to 1 ¼”. Notice how the front edge is cut off where the curved edge meets the hem- this prevents lengthening the garment in a consistent, back-to-front manner, impossible.It is sometimes possible, though costly, to narrow the lapel- the buttonhole creates certain restrictions. It is not possible to widen it. In some cases a peak can be converted to a notch, though never the reverse. The lower part of the front edge can be cut away more beneath the lowest buttonhole.Generally 2” to 2 ¼” given to lengthen the sleeve from the cuff- no allowance is given to lengthen from the top, but the sleeve can be shortened from the top.The sleeve can be narrowed (should really be done at the elbow seam) but no allowance is given to widen the top sleeve- extra width would be necessary to correct most sleeve “divot” problems so it is best not to attempt to have those altered.Some ready-made garments have a narrow vent, others have a wider vent. Making functional buttonholes on a narrow vent is impossible without either narrowing the sleeve or piecing in more cloth.Generally 2” to 2 ¼” given to lengthen the sleeve from the cuff- no allowance is given to lengthen from the top, but the sleeve can be shortened from the top.No allowance for changes given here.No allowance is given in ready-made (Oxxford is the only manufacturer that I am aware of who do give an allowance here) but bespoke will generally have an allowance for widening or narrowing the armhole, as well as widening the bicep and elbow. The cuff can be narrowed.No allowances for enlarging the trouser front are given in ready-made, bespoke often has an allowance to lengthen the rise from the waist. The leg can be narrowed easily, narrowing at the hip requires recrafting the pocket.Generally, 1 ½” given to let out the waist.Total to be let out 2 ½”.Ready-made has no allowance to let out the outseam, most bespoke does.Generally 1 1/8” to let out the back thigh, bespoke may have more. In most cases this allowance is tapered to nothing at the knee, though some manufacturers extend it all the way down to the hem.