Sewing a blazer with a notched lapel and welt pocket
A blazer sits at the useful end of a handmade wardrobe: smart enough for work, relaxed enough for dinner, and shaped in a way that ready-to-wear options rarely fit. Sewing your own lets you control the shoulder line, waist suppression and sleeve length while turning a practical jacket into something that feels distinctly personal.
A notched lapel gives a blazer its familiar tailored character, while a welt pocket adds a clean line across the chest without the bulk of a patch pocket. Both details demand patience. The lapel must roll smoothly from the collar into the front, and the welt must sit flat and feed neatly into an invisible pocket bag.
The rewards come through a measured sequence rather than a rush to the machine. In Australia, July belongs to winter, so this is a good time to cut a wool blazer for the cooler months; spring and summer call for lighter cloth or a more relaxed unlined version. Choose your fabric, establish the fit and check each stage before moving on.
Planning the silhouette and fit
Begin with a jacket or coat block that already resembles the silhouette you want, then compare it with a commercial blazer whose fit you admire. Make the muslin over the clothing you normally wear beneath it, not over a thick jumper. Australian pattern sizing usually works in centimetres, but bust, waist and hip measurements vary between brands, so use the finished garment measurements and your own measurements rather than relying on a nominal size.
Fit the shoulders first because moving them changes the balance of every other seam. The armhole should meet the shoulder with a smooth cap and no puckers, while the chest should be shaped by darts or gentle princess seams rather than a tight, straight side seam. Decide whether the jacket will be worn open or buttoned; a single-button blazer needs a little more room through the waist than a two-button design.
Work through collar height, lapel width, front length and vent placement before cutting precious fabric. A collar that sits too high can make the neck look short, and a lapel that is too narrow can look severe with a small checked fabric. A fitting works best when the talk stays as relaxed as an Australian “no worries” exchange: note the issue, make one adjustment and compare again. If another person is helping, set one fitting session and treat their preferences as design information rather than a contest. A parallel lesson appears in the Portuguese-language article on working through resistance, which considers what to do when a partner will not accept help: listen before trying to direct the outcome.
Choosing fabric and building the pattern
Fabric choice sets both the character and the workload. Medium-weight suiting wool gives structure and resists abrasion, while tropical wool or a wool-viscose blend is easier to handle in humid weather. Melbourne can serve up changeable conditions in a single afternoon, so a breathable wool with a light lining is often more useful than a heavy year-round coating. Sydney and Brisbane reward fabrics that drape rather than stand away from the body, especially when humidity softens the press.
Before buying, hold the cloth to the light, rub it between finger and thumb and check the finish on both sides. High-twist wool, firm worsteds and dense wool-silk blends hold a notch and roll line well; loosely woven checks can distort at the lapel seam. Many Australian haberdasheries sell cloth by the metre, while online shops offer downloadable patterns and prices in Australian dollars. Compare shrinkage, width and total metreage before paying rather than choosing only by the lowest AUD price.
Allow extra time for the hand-finished details that give a lapel and welt their crispness, including stay stitching, clipping and edge stitching. The reward is similar to that found in hand-sewing a quilted cover: small, controlled stitches make a flat surface look deliberate and give the piece a tactile finish that a rushed seam cannot match.
Choose the pocket finish before closing the front so its width, placement and facing can be planned with the garment. For a classic blazer, the single welt is usually the most versatile choice.
| Pocket finish | Appearance | Construction demand | Best suited to |
|---|---|---|---|
| Single welt | One clean horizontal band | Moderate | A versatile tailored blazer |
| Double welt | Two narrow parallel bands | Higher | Traditional or formal tailoring |
| Welt with flap | A band with a shaped flap | Higher | Patterned cloth or added coverage |
Cutting and forming the notched lapel
Once the pattern is adjusted, transfer it carefully and label every piece before cutting. Check the grain across the front, particularly with checks or stripes, and cut the front and back separately where the pattern allows. Fuse lightweight chest interfacing to the wrong side, following the grain, then add canvas interlining only over the roll line. Stay stitching around the neckline and front edge prevents those curves from growing during assembly.
The lapel needs a defined neckline, a notch and a lower point, with its seam allowance shaped to make the turning process manageable. If the pattern cuts the collar and lapel separately, join the upper collar to its undercollar first. Attach the collar stand at the neck and baste the lapel before committing to the final seam. Keep the notch area controlled by securing the layers with pins or temporary basting, then test the shape on the dress form or body before removing the basting.
Press in stages rather than crushing every seam at once. First shape the collar so it lies flat from the neck to the notch, then use a tailor’s ham or rolled towel to form the lapel’s roll over the chest. Clip curves only where the seam allowance would otherwise bunch, and avoid cutting into the notch, which can leave a weak, ragged edge. Let the piece cool under weight before moving it; this helps wool retain the curve you have created.
Constructing the welt pocket and assembling the blazer
Position the pocket on the wearer’s left chest according to the pattern, using the balance line between the armhole and centre front as a guide. Mark the opening, stay stitch both short ends and cut through the facing only. Prepare a pocket bag from lining fabric and clip its corners so it can spread without folds. A clean mouth, accurate ends and a firm attachment at the centre prevent the bag from showing when the jacket is worn.
Create the welt from a narrow strip of matching cloth or, for contrast, the lining fabric. Fold and press it to the required finished width, then enclose the raw edges of the pocket opening with the facing. Catchstitch around the opening, bar tack the ends if needed and topstitch the visible edge without pulling the cloth into ripples. Press the welt flat before enclosing it permanently; a slight bias in the strip will show immediately once it is stitched down.
With the pocket established, join the front and back at the shoulder, set the sleeves and close the side seams. Hang the partially finished blazer so gravity can reveal any mismatch before the lining goes in. Check that the pocket remains level when the garment hangs, then secure the lining and pocket bag together at the side seam. Add the back vent, close the lining at the hem and finish the sleeve lining with small, even stitches.
Finishing, styling and making the blazer yours
Final pressing matters as much as construction. Use a pressing cloth, steam from the wrong side and let the wool cool flat after closing the seams and setting the lapels. In humid coastal weather, hang the finished blazer on a broad, padded hanger and give it time to relax; a quick burst of steam can refresh the roll without leaving a wet mark. Remove all temporary basting, cut and finish the buttonholes, and attach the buttons with enough shank thread for the fabric to sit naturally.
Style it according to your actual routine rather than a formal uniform. For office wear in Sydney or Melbourne, pair it with straight trousers or a soft midi skirt and let the notched neckline remain the focus. A linen-blend version works for Brisbane lunches, while a wool blazer can carry through to Melbourne’s spring racing carnival, where it suits a dress, neat shirt and polished shoes. Australian smart-casual dressing often looks more convincing with a slightly softer fit than an extremely severe one.
Choose your fabric, label the pattern pieces and sew the welt sample from scrap cloth this week. Press it, compare it with the intended design and record any changes while the information is fresh. Then cut the front bodice and begin shaping a blazer that fits your body, your climate and your wardrobe.