PDF SEWING PATTERN | September Extended Coat | Merchant & Mills | UK 18–28

Skill Level: Intermediate
Sizes: UK 18–28
Language: English only

The September Extended Coat PDF sewing pattern by Merchant & Mills is an oversized overcoat that blends the relaxed feel of a duster with timeless workwear styling. Designed specifically for the extended size range, it can be sewn lined or unlined to suit every season.

Choose heavyweight linen for an elegant everyday coat, Dry Oilskin for wet-weather protection, wool for winter warmth or canvas and denim for a durable utility-inspired jacket. Its generous oversized silhouette makes layering effortless while maintaining a modern, relaxed look.

The September Extended Coat is intentionally oversized. We recommend checking the finished garment measurements to choose the amount of ease that best suits your personal style.

Looking for smaller sizes? The September Coat PDF Sewing Pattern is also available in UK sizes 6–18. Shop the standard size range here.

All seam allowances are 1.5 cm (⅝") unless otherwise stated and are included in the pattern.

• Oversized overcoat or duster coat
• Can be sewn lined or unlined
• Classic button-front closure
• Relaxed oversized fit for layering
• Suitable for medium to heavyweight woven fabrics
• Designed for UK sizes 18–28
• Intermediate sewing project

The September Extended Coat is suitable for medium to heavyweight woven fabrics.

• Mid to heavyweight linen
• 7–12 oz denim
• Wool
• Corduroy
• Cotton twill
• Canvas

Recommended lining fabrics:

• Barrier Lining (recommended for Oilskin)
• Cotton voile
• Lightweight linen
• Cotton poplin
• Hemp/cotton blends
• Lightweight wool
• Traditional slip lining
  

A heavier fabric creates a more structured coat, while linen offers a softer, more relaxed drape.

• Matching sewing thread
• 5 buttons measuring approximately 2 cm (¾")
• 1.3 m (1½ yd) interfacing (optional but recommended for most fabrics)
  

• Size 18: Bust 108.25 cm (42½"), Waist 91.25 cm (36"), Hips 114.25 cm (45")
• Size 20: Bust 114.5 cm (45"), Waist 97.5 cm (38½"), Hips 120.5 cm (47½")
• Size 22: Bust 120.75 cm (47½"), Waist 103.75 cm (41"), Hips 126.75 cm (50")
• Size 24: Bust 127 cm (50"), Waist 110 cm (43½"), Hips 133 cm (52½")
• Size 26: Bust 133.25 cm (52½"), Waist 116.25 cm (46"), Hips 139.25 cm (55")
• Size 28: Bust 139.5 cm (55"), Waist 122.5 cm (48½"), Hips 145.5 cm (57½")

• Size 18: Bust 139.9 cm (55"), Waist 143.4 cm (56½"), Hips 149.4 cm (58¾"), Length 123.2 cm (48½"), Sleeve Length 49 cm (19¼"), Bicep 51.1 cm (20")
• Size 20: Bust 145.6 cm (57¼"), Waist 149.7 cm (59"), Hips 155.7 cm (61¼"), Length 123.7 cm (48¾"), Sleeve Length 49 cm (19¼"), Bicep 53.3 cm (21")
• Size 22: Bust 152 cm (60"), Waist 156 cm (61½"), Hips 162 cm (63¾"), Length 124.1 cm (49"), Sleeve Length 49 cm (19¼"), Bicep 55.5 cm (21¾")
• Size 24: Bust 158.2 cm (62¼"), Waist 162.3 cm (64"), Hips 168.3 cm (66¼"), Length 124.6 cm (49"), Sleeve Length 49 cm (19¼"), Bicep 57.7 cm (22¾")
• Size 26: Bust 164.5 cm (64¾"), Waist 168.6 cm (66½"), Hips 174.6 cm (68¾"), Length 125 cm (49¼"), Sleeve Length 49 cm (19¼"), Bicep 59.9 cm (23½")
• Size 28: Bust 170.8 cm (67¼"), Waist 175 cm (69"), Hips 181 cm (71¼"), Length 125.5 cm (49½"), Sleeve Length 49 cm (19¼"), Bicep 62.1 cm (24½")

The same fabric quantities apply to both the outer fabric and the lining. Requirements apply to fabric with or without nap.

• 110 cm (43") wide: Sizes 18–20: 4.6 m (5 yd); Sizes 22–24: 5.5 m (6 yd); Sizes 26–28: 5.5 m (6 yd)
• 120 cm (47") wide: Sizes 18–20: 4.6 m (5 yd); Sizes 22–24: 4.7 m (5½ yd); Sizes 26–28: 5 m (5½ yd)
• 140 cm (55") wide: Sizes 18–20: 4 m (4½ yd); Sizes 22–24: 4 m (4½ yd); Sizes 26–28: 4.3 m (4¾ yd)
• 150 cm (60") wide: Sizes 18–20: 3.8 m (4 yd); Sizes 22–24: 4 m (4½ yd); Sizes 26–28: 4 m (4½ yd)

• A0 copy shop 6 pages
• A4 home printing 108 pages
• Compatible with A4 and US Letter paper
• Illustrated sewing instructions in English
• Instant PDF download

The September Extended Coat combines timeless style with everyday practicality. Whether you sew it in linen for effortless layering, wool for colder weather or Oilskin for rainy days, its oversized silhouette creates a sophisticated coat you'll enjoy wearing year after year.

This pattern is supplied as a digital PDF download in English. No paper pattern will be shipped.