Cosmo Shirt - Knitting Pattern for Babies in Debbie Bliss Luna

Cosmo Shirt – Knitting Pattern for Babies by Debbie Bliss in Luna Yarn

The Cosmo Shirt is a charming, classic baby shirt knitting pattern designed by Debbie Bliss, worked in her delicate Luna 4-ply yarn. This beginner-friendly pattern produces a neat, structured little top with a button opening, making it both practical for dressing small babies and beautifully finished as a gift or wardrobe staple. The pattern is available as a downloadable PDF and covers four sizes to take babies from their earliest months right through to two years old.

Sizes and Finished Measurements

The Cosmo Shirt is sized to fit babies at the following ages and corresponding finished chest measurements:

• 3–6 months: 53 cm / 21 in chest, 26 cm / 10¼ in length to shoulder, 15 cm / 6 in sleeve length
• 6–12 months: 57 cm / 22½ in chest, 30 cm / 11¾ in length to shoulder, 18 cm / 7 in sleeve length
• 12–18 months: 61 cm / 24 in chest, 34 cm / 13½ in length to shoulder, 21 cm / 8¼ in sleeve length
• 18–24 months: 66 cm / 26 in chest, 38 cm / 15 in length to shoulder, 25 cm / 9¾ in sleeve length

What Is Being Made

The Cosmo Shirt is a baby top with a structured, shirt-like silhouette. It features a neat button fastening — a practical and endearing detail that makes it easy to dress and undress a young baby. The garment is seamed, giving it a tidy, professional finish that holds its shape well through repeated washing and wearing. With its clean lines and classic construction, it suits both everyday wear and special occasions.

Techniques Used

This pattern is rated as beginner level, making it an excellent choice for knitters who are relatively new to garment construction but are ready to move beyond simple accessories. The techniques involved include:

• Worked flat: All pieces are knitted back and forth in rows on straight needles, rather than in the round, which is ideal for beginners who prefer a straightforward approach to garment knitting.
• Seamed construction: The individual pieces — front, back, and sleeves — are joined together using seaming after knitting is complete. This traditional method produces a sturdy, well-structured garment.
• Buttonholes: The pattern includes the working of buttonholes to accommodate the button fastening, a useful skill for any knitter to develop and one that adds a polished, functional detail to the finished shirt.
• Buttons: Three buttons are attached to complete the opening, adding both practicality and a decorative element.
• Increasing (m1 and inc): The pattern uses standard increase techniques, including make one (m1) by picking up and working into the back of the loop lying between stitches, to shape the garment pieces.
• Decreasing (skpo): Shaping also involves skpo (slip one, knit one, pass slipped stitch over), a standard left-leaning decrease used in garment shaping.

Stitches Used

The Cosmo Shirt uses a small, accessible vocabulary of stitches, making it very approachable for beginner knitters:

• Stocking stitch (st st): The main body fabric of the shirt is worked in stocking stitch — knit on the right side, purl on the wrong side — creating a smooth, classic fabric that drapes softly against a baby's skin.
• Garter stitch (g-st): Garter stitch, worked by knitting every row, is used for borders and edging details, providing a neat, non-curling finish that frames the garment tidily.
• Yarn forward (yf): Used in combination with other stitches to create the buttonholes, the yarn forward is a simple technique that produces a small, neat eyelet opening.
• Knit through back loops (t