• Prerequisites: darts and pleats sewn; Seams: plain, French and flat-felled.
• Time: 45–90 minutes for a pair.
• Difficulty: side-seam easy; slant moderate.
• Tools: edge-stitch foot, stay tape or fusible strip, pocketing, point turner.

Typical starting points only; check against the wearer’s hand (four fingers plus thumb joint should slide in) and a phone if they want one. Teacher to check.

A pocket stay is an extension of the facing or bag that reaches across the front to the fly and is caught into the fly seam. It holds the front panel smooth, stops slant pockets gaping, keeps pleats hanging straight, and gives a gentle “tummy control” effect on women’s and men’s trousers alike. To add one, extend the back bag piece to the centre front on the pattern, then baste it into the waist and catch it in the fly stitching. Leave it out on children’s trousers and loose casual styles.

• Side-seam pocket with extended facings: cut 1½ in (4 cm) wide extensions on the front and back legs at the opening, so the bag seam sits back from the edge and the lining never shows. Good for pyjamas, salwars with pockets, and children’s trousers.
• Curved (Western) front pocket: the same as a slant pocket, with a curved edge; clip the curve before turning. Jeans use this; see Jeans front pockets and back patch pockets.
• Straight-down “on seam” with topstitching for casual trousers.
• Pocket in an elastic waist: keep the bag top below the casing, or catch it into the casing seam on the front only.
• Zip in a side-seam pocket for travel trousers: sew an exposed zip in the opening before the bag.
• Adaptive wear: wider openings and side-seam pockets placed slightly forward are easier to reach when seated (Module 3, Older bodies, seated and adaptive wear).
• Left-handed: wearers who are left-handed sometimes like a deeper left pocket or a phone pocket on the left; ask at the fitting.

• Order: slant pockets are sewn on the flat front after darts and pleats, before the fly. Side-seam pockets are prepared on flat pieces and closed when the side seam is sewn.
• Match the two pockets: lay the fronts together after each step; openings must be the same height and length.
• Grain: the slant edge is on the bias; handle it as little as possible and stay it at once.
• Speed: slow at the pivots and at the end of the opening.

1. Understitch every bag edge that meets an opening; it keeps the lining from peeking out (from the D&D ebook’s construction tricks).
2. Bar-tack the bottom of a slant pocket, not only the top, so phones do not drag the bag down.
3. Stay tape the slant line a little shorter than the cut edge (by 1/8–1/4 in, 3–6 mm) to stop gaping on a curvy hip. Teacher to check.
4. Cut the facing from the main cloth and the bag from pocketing; the inside of the pocket looks right and the hip stays smooth.
5. Use self cloth for bags on lightweight trousers so lining does not show through.
6. French-seam the bag bottom on unlined fine trousers; it looks neat and does not fray.
7. Double-stitch the bag bottom; coins and keys wear through.
8. Roll the edge a hair to the inside when pressing the slant edge, so the bag seam is not visible.
9. For a skin-coloured look on pale trousers, use a skin-tone pocketing near the wearer’s own colour.
10. Mark the pocket notch on the waistband so the pocket top lines up with the band.
11. What professionals do differently: they add a pocket stay and stay tape as standard on tailored fronts; it is the reason ready-to-wear slant pockets lie flat.

The slant pocket gapes open

1. Unpick and add stay tape, eased slightly shorter than the edge.
2. Add a pocket stay to the fly.
3. Prevention: stay every slant edge, and check the hip is not too tight (gaping is often a fit sign).

The lining shows at the opening

1. Understitch the bag, or add a line of topstitching.
2. Re-press with the edge rolled inside.
3. Prevention: understitch as standard, or use extended facings.

The pocket bag shows through the front

1. Change to lighter or skin-tone pocketing.
2. Press the bag seams flat and trim bulk.
3. Prevention: test pocketing under the cloth before cutting.

The pocket tears at the bottom of the opening

1. Darn or patch the tear from inside, then bar-tack.
2. Add a small reinforcement square of interfacing.
3. Prevention: bar-tack top and bottom of every opening.

The side-seam pocket bag flips to the back

1. Stitch the bag to the front waist allowance or into the waistband.
2. Press the bag towards the front.
3. Prevention: baste the bag top into the waist before attaching the band.

The two pockets are different heights

1. Unpick the higher one and match it to the lower.
2. Re-mark from the pattern.
3. Prevention: lay the fronts together and check after each step.

The pocket is too small

1. Replace the bag with a deeper one; the opening can stay.
2. Extend the bag down and sew a new bottom seam.
3. Prevention: measure the wearer’s hand and phone at the fitting.

• Myth: pockets make hips look wider. Badly sewn pockets that gape draw the eye; flat, stayed pockets do not change the line.
• Mistake: cutting bags from heavy main cloth.
• Mistake: leaving the slant edge unstayed.
• Mistake: forgetting the facing, so lining shows every time a hand goes in.

1. Beginner: sew a side-seam pocket in two cotton scraps sewn as a mini side seam.
2. Improver: sew a slant pocket on a scrap front with stay tape and understitching.
3. Confident: sew matching slant pockets with a pocket stay on a women’s or men’s trouser front.

As a hobby: adding pockets to a pocketless trouser or salwar is a favourite first improvement.

For earning: “add pockets” is a frequent request, especially for women’s ready-made trousers and festive pants; side-seam pockets can often be added in an existing seam.

For teaching: make a half-scale practice front so learners can sew a slant pocket in one class.

• Empty pockets before washing; heavy items stretch bags.
• Press pocket openings from the inside, through a press cloth.
• Check bar tacks after the first few wears; resew if loose.

• Can you sew a side-seam pocket with understitched bags?
• Do you stay-tape slant edges?
• Do you know what a pocket stay does?
• Are your two pockets the same height?

Quiz

1. Why is a slant edge stayed? Answer: it is on the bias and stretches.
2. What is a facing in a pocket? Answer: main cloth sewn onto the bag so lining does not show.
3. Where should bar tacks go on a slant pocket? Answer: top and bottom of the opening.
4. What does a pocket stay reach to? Answer: the fly, at the centre front.

• Pocket bag: the inner pouch.
• Pocket facing: main cloth on the inside of the opening.
• Understitching: stitching the seam allowance to the facing or bag only, close to the seam.
• Stay tape: a narrow tape that stops stretching.
• Bar tack: a short, dense zigzag that reinforces a stress point.
• Pocket stay: a bag extension caught into the fly.

• Main source: D&D’s own trousers ebook, chapters 44 and 47 (understitching the bag, bar-tacking the base of a slant pocket), with general, widely taught practice.
• Pocket sizes are typical starting points and vary by brand. Teacher to check.