A pencil skirt fits when it has about 5 cm (2 in) of ease at the hip, a waist that sits at your natural waist without rolling, darts that end above the fullest part of the seat and tummy, and a back vent long enough to walk and climb stairs: 15 cm (6 in) or more on a knee-length skirt. Fit it in that order, hip first, then waist and darts, then the taper and the vent, because each decision changes the one after it.
How do you tell what is wrong with a pencil skirt?
Put the skirt or the toile on over the underwear you will wear, stand naturally, then walk, sit and climb a step. The fabric pulls toward wherever it is short of room. Reading drag lines is the general skill; on a pencil skirt the usual messages are these.
| Symptom | Cause | Fix |
|---|---|---|
| Horizontal pull lines across the hip or seat | Not enough hip ease | Add width at the side seams from the hip line down |
| Skirt rides up when you walk | Hip or thigh too tight, or vent too short | Add hip ease; lengthen the vent |
| Waistband rolls over or digs in | Waist too tight, or the skirt sits above the natural waist | Add waist width; check waist to hip length |
| Fold of fabric under the back waist | Swayback: center back too long | Remove a wedge at the center back waist |
| Bubble of fabric at the dart tips | Darts too long or too pointed | Shorten the darts; curve the last 3 cm (1 1/4 in) |
| Hem kicks forward at the front | Tummy pushes the front up | Add length at the center front waist, lengthen the front darts |
| Hem kicks back, seat looks tight | Seat needs length | Add length at the center back waist; more back dart intake |
| Diagonal lines from hip toward the vent | Taper too strong for your stride | Reduce the taper; lengthen the vent |
| Vent gapes open | Underlap pressed to the wrong side, or seat tight | Press the vent toward the left back; add seat room |
Which measurements decide how a pencil skirt fits?
Four numbers draft the skirt, and a fifth saves a toile.
- Waist, at the natural waist, with a finger under the tape.
- Hip, around the fullest part of the hips and seat, feet together. Sit down and measure again: the seat spreads by 2 to 5 cm (3/4 to 2 in), which is why the skirt needs ease at all.
- Waist to hip, down the side from the waist to the level of the fullest part. Usually 18 to 24 cm (7 to 9 1/2 in).
- Length, from the waist to where you want the hem; knee length is the waist-to-knee measurement, plus 2 cm (3/4 in) for the hem to cover the kneecap.
- High hip or tummy, about 10 cm (4 in) below the waist. If it is close to the full hip, the front darts need to be shorter and the side seam straighter between waist and hip.
How much ease does a pencil skirt need?
The wearing ease depends on the fabric.
| Fabric | Hip ease | Waist ease |
|---|---|---|
| Woven with no stretch (wool suiting, crepe, linen) | 5 cm (2 in) | 2 cm (3/4 in) |
| Stretch woven (cotton sateen or denim with 2 to 3 % elastane) | 2.5 to 4 cm (1 to 1 1/2 in) | 1 to 2 cm (3/8 to 3/4 in) |
| Ponte or heavy double knit | 0 to 2 cm (0 to 3/4 in) | 0 to 1 cm (0 to 3/8 in) |
Compare the pattern with these numbers before cutting: measure the pattern across the hip line, subtract the seam allowances, double it, and subtract your hip.
How do you alter the pattern, step by step?
Work in this order and redraw the side seams smoothly after every change.
- Hip width. Difference between the hip ease you want and the ease you have, divided by four, added to or removed from each side seam edge (front and back, both sides) at the hip line. Blend the new line to the original hem and up to the waist.
- Waist width. Same arithmetic at the waist. Up to 2 cm (3/4 in) in total can go into the side seams; more than that, change the dart intake instead, keeping each dart between 1.5 and 3 cm (5/8 and 1 1/4 in) wide.
- Waist to hip. If your fullest point is lower than the pattern's hip line, slash across the pattern between the waist and the hip line and spread by the difference; if higher, overlap.
- Dart length. Front darts end 8 to 10 cm (3 to 4 in) below the waist, well above the tummy; back darts 12 to 14 cm (4 3/4 to 5 1/2 in), ending above the fullest part of the seat. How to sew darts shows how to taper the last stitches so the tip lies flat.
- Swayback. Fold out a wedge of 1 to 2 cm (3/8 to 3/4 in) at the center back waist, tapering to nothing at the side seam; swayback adjustment covers the full method.
- Taper. A pencil skirt narrows from the hip to the hem by 1 to 2 cm (3/8 to 3/4 in) at each side seam. More taper looks sharper and walks worse; the hem should be at least 6 cm (2 1/4 in) smaller than the hip and no smaller than that unless you lengthen the vent.
- Vent. Decide its length last, once the hem width and skirt length are final: see below.
How long should the walking vent be?
A free stride needs a hem opening of about 100 to 110 cm (40 to 43 in) at knee level. A knee-length pencil skirt with a 98 cm hip and a 1.5 cm taper per side has a hem of about 92 cm, so without an opening every step is shortened. When the two sides of the vent swing apart by 15 cm (6 in), the hem opening grows by the same amount.
- Knee length (hem about 60 cm (23 1/2 in) from the waist): a vent 15 to 20 cm (6 to 8 in) long, starting about 25 cm (10 in) below the hip line.
- Midi (hem 70 to 80 cm (27 1/2 to 31 1/2 in) from the waist): 20 to 25 cm (8 to 10 in).
- Mini: often no vent at all; a hem above the knee already opens enough.
A vent is an overlapping extension, 4 cm (1 5/8 in) wide, on both back pieces, pressed to the left as worn and held by a diagonal line of stitching at the top; it stays closed when you stand and opens as you walk. A slit is the same opening without the extension, and it shows more; a kick pleat folds the extension inside. The pencil skirt project sews the vent step by step together with the invisible zip above it.
How do you test the fit before cutting the fabric?
Sew a toile in a woven of similar weight, vent included, then do the three tests a pencil skirt fails most often: sit on a hard chair and check that the waistband does not dig in and the hem rides no more than 5 cm (2 in) up the thigh; walk ten normal steps and feel whether the skirt tugs at the back of the thighs; climb a step. Mark the changes on the toile, transfer them to the pattern, and if you altered more than the hip or the waist, make a second toile in a fabric with the same stretch as the real one.
What does made-to-measure drafting take care of, and what is left to check?
A skirt drafted from your own waist, hip, waist-to-hip and length starts with the hip line at your fullest point and the ease already added, so the first three steps of the alteration list are done before you print. Sewly's pencil skirt pattern is drafted that way, fitted at the waist with darts and 5 cm (2 in) of ease at the hip for a woven, with a taper you set between 0 and 4 cm (0 and 1 5/8 in) per side, a back vent you can switch off, and an invisible zip at the center back. What a draft cannot see is posture and shape: a swayback, a prominent seat or a tummy that needs shorter darts. Those still show on a toile, and they are quick fixes once the hip and waist are right.