"Sebastian Jumper" - Jumper Knitting Pattern in MillaMia Naturally Soft Merino

Sebastian Jumper – Knitting Pattern in MillaMia Naturally Soft Merino

The Sebastian Jumper is a classic, everyday boys' sweater knitting pattern published by MillaMia, designed for children aged 1–2, 3–4, 5–6, and 7–8 years. Rated as an experienced / advanced skill level pattern, it is a rewarding project for confident knitters who are comfortable with shaping techniques and garment construction. The finished jumper is a versatile, wearable piece with thoughtful details including a shaped collar with short row volume and neat side vents — making it a practical wardrobe staple for everyday wear.

Garment Overview and Sizing

The Sebastian Jumper is worked to fit the following actual chest measurements:

• 1–2 years: 57 cm / 22½ in chest, 33 cm / 13 in length to shoulder, 19 cm / 7½ in sleeve length
• 3–4 years: 64 cm / 25 in chest, 39 cm / 15½ in length to shoulder, 23 cm / 9 in sleeve length
• 5–6 years: 70 cm / 27½ in chest, 45 cm / 17¾ in length to shoulder, 28 cm / 11 in sleeve length
• 7–8 years: 76 cm / 30 in chest, 53 cm / 21 in length to shoulder, 33 cm / 13 in sleeve length

These measurements reflect the actual garment dimensions, so knitters should select the size based on their child's chest measurement and preferred ease.

Construction Method and Techniques

The Sebastian Jumper is constructed bottom-up and worked flat in separate pieces that are then seamed together — a traditional approach well-suited to structured, tailored children's knitwear. Working flat means each piece (front, back, and sleeves) is knitted back and forth on straight needles, giving clean, even edges that are easy to seam neatly.

Key construction and shaping techniques used in this pattern include:

• Bottom-up construction: The body and sleeves are begun at the lower edges and worked upward toward the shoulders, allowing the knitter to try the garment on as they go.
• Short row shaping: Used specifically in the collar to add three-dimensional volume and a more fitted, natural drape around the neckline — a technique that involves working partial rows to create subtle curves without adding or removing stitches in the traditional sense.
• Buttonhole construction: The pattern includes 6 small buttons (approximately 13 mm / ½ in diameter), with corresponding buttonholes worked into the knitting — a detail that adds a polished, practical finish to the collar or neckline opening.
• Seamed finishing: Side seams, sleeve seams, and shoulder joins are sewn together after knitting. Importantly, knitters are instructed to leave a gap at the bottom of the side seams to create the characteristic side vents — a smart design feature that adds movement and a slightly more grown-up aesthetic.
• Increases and decreases: Standard shaping techniques including k2tog (knit two together), p2tog (purl two together), m1 (make one by picking up the loop before the next stitch and knitting into the back of it), and m1p (the purl version of the same increase) are used throughout for sleeve shaping and neckline shaping.

Stitches Used

The Sebastian Jumper draws on a focused set of classic knitting stitches:

• Stocking stitch (stockinette stitch): The primary stitch used across the body and sleeves, creating a smooth, flat fabric with a clean knit face — ideal for showcasing the softness of the yarn and the simplicity of the design.
• Garter stitch: Used for textural contrast or borders, garter stitch is formed by knitting every row, producing a ridged, reversible fabric.
• Rib stitch: Typically used for cuffs, hems, and neckbands, ribbing creates an elastic, structured