FREE Onesie Cardigan Pattern

heather handmade sewing

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Learn how to make a cute onesie out of a cardigan with this free sewing pattern! This upcycling pattern comes in size 0-3 months.

I’ll admit it; I love cardigans. I love cardigans on myself, on little boys, and especially on babies. I had some girly cardigans in my stash that needed to be made into baby onesies for my daughter, so I made a free pattern and tutorial for you to make your own onesie cardigan!

It’s even a simple and quick gift to make for baby shower gifts! I just love baby sewing projects!

Use a cardigan with fun details to make an extra special cardigan! I love sew clothes for babies!

It’s great for layering and for tummy time.

FREE PATTERN: Onesie Cardigan

what is a pdf sewing pattern?

A PDF pattern is a sewing pattern designed on the computer and organized so that it can be printed on several letter or A4 size pieces of paper.

I love using PDF sewing patterns because if the pattern gets ruined or if my children or I changed sizes, I can always print it again. It’ll never be destroyed since I have a digital version!

how do you use a PDF sewing pattern?

Open the PDF on a computer and click print. When printing make sure that the scaling is set to 100% or no scaling so that the pattern prints at the correct size.

Once the pattern is printed it can be taped together to get the full size. Then the pattern can be cut for each pattern piece size or individual sizes can be traced so that the pattern can be used again and again. Learn how to use PDF sewing patterns.

FREE Onesie Cardigan Pattern


Use the pattern to cut out the onesie. Place the center front along the button placket and the center back along the center back. The sleeves can either be cut out along the sleeve cuff or fold the sleeve in half for a folded hem.

FREE PATTERN: Onesie Cardigan

With right sides together sew the shoulders together. Finish the edges.

Tack the seam allowance towards the back at the neckline.

FREE PATTERN: Onesie Cardigan

With right sides together sew sleeves onto the shoulders. Finish edges.

With right sides together sew sides together. Finish edges.

Tack the seam allowances towards the back.

FREE PATTERN: Onesie Cardigan

Sew single fold bias tape onto the leg openings. If you want it to show, sew it on the inside first. Then fold it towards the front and sew close to the edge. If you don’t want it to show, sew it on the outside first. Then fold it towards the inside and sew close to the edge.

FREE PATTERN: Onesie Cardigan

Insert 10 inches of elastic into each leg opening tacking at the ends.

Use the bias tape to finish the edges of the crotch. When you sew it on, fold the bias tape around the edges to give it a finished edge.

Attach some snaps or add buttons or buttonholes!

FREE PATTERN: Onesie Cardigan

Put the onesie cardigan on your baby to enjoy all the adorableness!

FREE PATTERN: Onesie Cardigan

Look at those perfect baby legs in an adorable onesie cardigan!

FREE PATTERN: Onesie Cardigan

I tried to get a smile, but she cried whenever I put the camera up to my face.

Get the Free Sewing Pattern here!

Get the free onesie cardigan sewing pattern

If you make something using this tutorial, I’d love to see! Please share it on social media with the hashtag #heatherhandmade and tag me!

FREE PATTERN: Onesie Cardigan
heather sewing

I believe small sewing moments can create great joy. Find your own “right” way to sew. -Heather

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It's super cute! As is the model.

I've just shared it on And Sew We Craft today. You can find it here:

What a cutie! Fun idea I love the purple on her 🙂

Always sharing great ideas Heather! And Claire, oh my she's just adorable!

Adorable!! I've got a Craft Gossip post scheduled for later this afternoon that links to your tutorial:

Oh that baby pudge! Great pattern too 😉

<3 very cute. did you use snaps at the crotch seam or just sew it together and the elastic in the legs made it able to slip on& off?

Soooo super cute, I love this idea!