Black Cat Kids Onesie Free Crochet Pattern

Thanks for checking out my black cat kids’ onesie free crochet pattern. I wanted to make my daughter a nice warm Halloween costume this year and came up with the black cat onesie.

Black cat kids onesie description

The best part is that it can also be worn as pyjamas all year round too! Unlike a costume she would wear once then outgrow by next Halloween, she can really get some use out of this one and wear it again and again.

The black cat kids’ onesie is suitable for children aged 2 to 10 years. The crochet pattern includes 8 different sizes and has handy tips on how to alter the length of the torso, legs and sleeves so you can easily adjust for the perfect fit.

The all-in-one pyjamas are designed to be loose fitting for comfort. It can also be worn as a Halloween costume. The hooded onesie is warm and cosy and features fun cat’s ears, tail and whiskers.

How to crochet a kids cat costume

The black cat kids’ onesie free crochet pattern is easy skill level. You will need to know all your basic crochet stitches as well as having good sewing skills. The onesie itself is made in one-piece. The cat tail and ears are then sewn on at the end. You’ll also need some basic tapestry skills for the cat’s whiskers.

To make the crochet jumpsuit I used aran (weight 4) yarn in 2 colors, 5 buttons and a small amount of toy stuffing for the tail. I also used a 5mm crochet hook and tapestry needle.

Gauge is very important for this crochet pattern. It is essential you make a swatch before you start and check your gauge on the garment after each section. Skipping this step could result in your onesie not fitting your child.

Why You’ll Love The Free Onesie Crochet Pattern

• Easy skill level
• 8 sizes: 2 to 10 years old
• Onesie is made in one-piece, just sew on the tail and ears!
• Perfect gift for Halloween or cat lovers
• Free crochet pattern with the option to upgrade

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Free Crochet pattern information

Supplies

• 5mm crochet hook
• Worsted weight 4 yarn
• Scissors
• Sewing needle
• Toy stuffing for tail
• 5 x 15mm buttons

Yarn

• Weight: Aran/ Worsted / #4
• Brand: Stylecraft special aran
• Age 2-3 (3-4, 4-5, 5-6, 6-7, 7-8, 8-9, 9-10)
• A – Black: 851 (927, 1013, 1095, 1186, 1281, 1374, 1477) yds
• B – White: 36 (37,40,41,43,45,46,48) yds

Skill Level

Easy

Gauge

• 2″ x 2″ gauge swatch = 6 rows of 7 hdc

Sizes

Measurements are of completed garments. Note, the onesies are loose fitting for comfort.

• Age 2-3 (3-4, 4-5, 5-6, 6-7, 7-8, 8-9, 9-10)
• Hip circumference: 24″ (25, 26, 27, 28, 29, 30, 31)
• underarm to wrist: 8.5″ (9.5, 10.5, 11, 11.5, 12, 12.5, 13)
• Groin to ankle: 10″ (11.25,13, 14.75, 16.5, 18, 19.75, 21.25)

Abbreviations

US Terminology (UK Translation)

• ch – Chain
• dc – Double crochet
• hdc – Half double crochet
• 2hdc – 2 hdc in 1 space (increase)
• hdc2tog – hdc 2 together (decrease)
• RS – Right side
• sc – Single crochet
• 2sc – 2 sc in 1 space (increase)
• sc2tog – sc 2 together (decrease)
• sl st – Slip stitch
• st/sts – Stitch/Stitches
• WS – Wrong side

Pattern notes

• Chains and finishing slip stitches are not included in stitch count.
• Stitches separated with a comma are to be made in separate spaces. e.g., “sc, dc” would mean “single crochet in first space, double crochet in next space”.
• Change colors while completing the last stitch on the previous row.
• This crochet pattern is written in age 2-3 and all other sizes are written in brackets in the following format: Age 2-3 (3-4,4-5,5-6,6-7,7-8,8-9,9-10).
  EG: hdc x 20(21,22,23,24,25,26,27) will mean hdc x 20 for age 2-3, hdc x 21 for age 3-4, hdc x 22 for age 4-5 etc.
• If there is only 1 number it applies to all sizes.

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free crochet pattern: Cat Kids Onesie

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Chest

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Row 1

• Use yarn color A (black)
• ch x 49 then start in second ch from hook
• (2hdc, hdc x 7) 6 times
• ch x 1 & turn

54 sts

Row 2

• (hdc x 4, 2hdc, hdc x 4) 6 times
• ch x 1 & turn

60 sts

Row 3

• (2hdc, hdc x 9) 6 times
• ch x 1 & turn

66 sts

Row 4

• (hdc x 5, 2hdc, hdc x 5) 6 times
• ch x 1 & turn

72 sts

Row 5

• (2hdc, hdc x 11) 6 times
• ch x 1 & turn

78 sts

Row 6

• (hdc x 6, 2hdc, hdc x 6) 6 times
• ch x 1 & turn

84 sts

Row 7

• (2hdc, hdc x 13) 6 times
• ch x 1 & turn

90 sts

Row 8

• (hdc x 7, 2hdc, hdc x 7) 6 times
• ch x 1 & turn

96 sts

Row 9

• (2hdc, hdc x 15) 6 times
• ch x 1 & turn

102 sts

Row 10

• (hdc x 8, 2hdc, hdc x 8) 6 times
• ch x 1 & turn

108 sts

Row 11

• (2hdc, hdc x 17) 6 times
• ch x 1 & turn

114 sts

Row 12

• (hdc x 9, 2hdc, hdc x 9) 6 times
• ch x 1 & turn

120 sts

Row 13

• (2hdc, hdc x 19) 6 times
• ch x 1 & turn

126 sts

Row 14

• (hdc x 10, 2hdc, hdc x 10) 6 times
• ch x 1 & turn

132 sts

Row 15

• (2hdc, hdc x 21) 6 times
• ch x 1 & turn

138 sts

Row 16

• (hdc x 11, 2hdc, hdc x 11) 6 times
• ch x 1 & turn

For age 2-3 skip to waist after this row

144 sts

Row 17

• (2hdc, hdc x 23) 6 times
• ch x 1 & turn
• For age 3-4 skip to waist after this row

150 sts

Row 18

• (hdc x 12, 2hdc, hdc x 12) 6 times
• ch x 1 & turn
• For age 4-5 skip to waist after this row

156 sts

Row 19

• (2hdc, hdc x 25) 6 times
• ch x 1 & turn
• For age 5-6 skip to waist after this row

162 sts

Row 20

• (hdc x 13, 2hdc, hdc x 13) 6 times
• ch x 1 & turn
• For age 6-7 skip to waist after this row

168 sts

Row 21

• (2hdc, hdc x 27) 6 times
• ch x 1 & turn
• For age 7-8 skip to waist after this row

174 sts

Row 22

• (hdc x 14, 2hdc, hdc x 14) 6 times
• ch x 1 & turn
• For age 8-9 skip to waist after this row

180 sts

Row 23

• (2hdc, hdc x 29) 6 times
• ch x 1 & turn
• For age 9-10 skip to waist after this row

186 sts *Premium pattern has image here*

Waist

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Row 1

The skipped stitches will be the arm holes

• hdc x 20 (21,22,23,24,25,26,27)
• Skip 31 sts (32,33,34,35,36,37,38)
• hdc x 42 (44,46,48,50,52,54,56)
• Skip 31 sts (32,33,34,35,36,37,38)
• hdc x 20 (21,22,23,24,25,26,27)
• ch x 1 & turn

82 sts (86,90,94,98,102,106,110) *Premium pattern has image here*

Rows 2 – 17

• hdc x 82 (86,90,94,98,102,106,110)
• ch x 1 & turn

16 rows *Premium pattern has image here*

Hips

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After round 20 both sides should join under the crotch. Add or remove rounds if you need to. 3 rounds are equal to 1”.

Rounds 1 – 20

• hdc x 82 (86,90,94,98,102,106,110)
• sl st to 1st st, ch x 1 & turn

20 rounds *Premium pattern has image here*

Legs

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Check if you’re starting the leg on RS or WS and make a note to remind you for the second leg.

Part 1 – Thigh

Round 1

• hdc x 41 (43,45,47,49,51,53,55)
• skip x 41 (43,45,47,49,51,53,55)
• sl st to 1st st, ch x 1 & turn

41 sts (43,45,47,49,51,53,55)

Rounds 2 – 9 (10,12,14,16,18,20,22)

• hdc x 41 (43,45,47,49,51,53,55)
• sl st to 1st st, ch x 1 & turn

8 rounds (9,11,13,15,17,19,21)

Part 2 – Knee

Round 1

• hdc2tog
• hdc x 12 (12,13,14,14,15,16,16)
• hdc2tog
• hdc x 12 (12,13,14,14,15,16,16)
• hdc2tog
• hdc x 11 (13,13,13,15,15,15,17)
• sl st to 1st st, ch x 1 & turn

38 sts (40,42,44,46,48,50,52)

Rounds 2 – 9 (10,11,12,13,14,15,16)

• hdc x 38 (40,42,44,46,48,50,52)
• sl st to 1st st, ch x 1 & turn

8 rounds (9,10,11,12,13,14,15)

Part 3 – Calf

Add/remove rounds from this area if you need to adjust length. 3 rounds is equal to 1”. Remember, the cuff on the next section will measure 1”.

Round 1

• hdc2tog
• hdc x 11 (11,12,13,13,14,15,15)
• hdc2tog
• hdc x 11 (11,12,13,13,14,15,15)
• hdc2tog
• hdc x 10 (12,12,12,14,14,14,16)
• sl st to 1st st, ch x 1 & turn

35 sts (37,39,41,43,45,47,49)

Rounds 2 – 9 (11,13,15,17,19,21,23)

• hdc x 35 (37,39,41,43,45,47,49)
• sl st to 1st st, ch x 1 & turn

8 rounds (10,12,14,16,18,20,22) *Premium pattern has image here*

Part 4 – Cuff

Change to color B (white). Work from the RS of onesie.

Round 1

• sc2tog, sc x 3 (4,4,4,5,5,5,6)
• Repeat the above step 5 more times
• sc x 5 (1,3,5,1,3,5,1) in last sts
• sl st to 1st st & ch x 1

29 sts (31,33,35,37,39,41,43)

Rounds 2 – 4

• sc x 29 (31,33,35,37,39,41,43)
• sl st to 1st st & ch x 1
• Fasten off after round 4 & weave in ends.

3 rounds of 29 sts (31,33,35,37,39,41,43) *Premium pattern has image here*

2nd leg

• Attach yarn A (black) to 1st skipped stitch at crotch.
• Check the note you made earlier about starting on the RS or WS. Start on the same side for this leg too.
• Repeat all leg rounds as you did for the 1st leg.
• Weave in all ends and sew up gap at crotch.
• *Premium pattern has image here*

Sleeves

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Round 1

• Use yarn color A (black)
• Attach yarn to 1st skipped st of arm hole & ch x 1.
• Start on RS (WS,RS,WS,RS,WS,RS,WS)
• hdc x 31 sts (32,33,34,35,36,37,38) into all stitches
• sl st to 1st st, ch x 1 & turn
• You will be left with a little gap under the arm which you can close up as you weave in the ends later on.

31 sts (32,33,34,35,36,37,38)

Round 2

• hdc2tog
• hdc x 13 (14,14,15,15,16,16,17)
• hdc2tog
• hdc x 14 (14,15,15,16,16,17,17)
• sl st to 1st st, ch x 1 & turn

29 sts (30,31,32,33,34,35,36)

Rounds 3 – 9

• hdc x 29 (30,31,32,33,34,35,36)
• sl st to 1st st, ch x 1 & turn

7 rounds

Round 10

• hdc2tog
• hdc x 7 (8,8,8,9,9,9,10)
• hdc2tog
• hdc x 8 (8,8,9,9,9,10,10)
• hdc2tog
• hdc x 8 (8,9,9,9,10,10,10)
• sl st to 1st st, ch x 1 & turn

26 sts (27,28,29,30,31,32,33)

Rounds 11 – 22 (25,28,29,31,33,34,36)

Add or remove rounds from this area if you need to. 3 rounds are equal to 1”. Remember, the 1” cuff on the next section will measure 1”.

• hdc x 26 (27,28,29,30,31,32,33)
• sl st to 1st st, ch x 1 & turn

12 rounds (15,18,19,21,23,24,26) *Premium pattern has image here*

Cuff

Change to color B (white). Work from the RS of onesie.

Round 1

• sc2tog, sc x 2 (2,2,2,3,3,3,3)
• Repeat the above step 5 more times
• sc x 2 (3,4,5,0,1,2,3) in last sts
• sl st to 1st st & ch x 1

20 sts (21,22,23,24,25,26,27)

Rounds 2 – 4

• sc x 20 (21,22,23,24,25,26,27)
• sl st to 1st st & ch x 1
• Fasten off after round 4 & weave in ends.

3 rounds of 20 sts (21,22,23,24,25,26,27)

2nd sleeve

• Attach yarn A (black) to 1st skipped stitch under arm. Start working from the RS (WS,RS,WS,RS,WS,RS,WS)
• Repeat all sleeve rounds as you did for the 1st sleeve.
• Weave in all ends and sew up gap under arm.

Hood

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Row 1

• Use yarn color A (black)
• Attach yarn to the left side of row 1 chains
• hdc x 48 in all ch spaces
• ch x 1 & turn

48 sts

Row 2

• (2hdc, hdc x 7) 6 times
• ch x 1 & turn

54 sts

Row 3

• (hdc x 4, 2hdc, hdc x 4) 6 times
• ch x 1 & turn

60 sts

Rows 4 – 28 (29,30,31,32,33,34,35)

• hdc x 60
• ch x 1 & turn

25 rows (26,27,28,29,30,31,32)

Row 29 (30,31,32,33,34,35,36)

• hdc x 27, hdc2tog x 3, hdc x 27
• sl st into 1st st of the row
• Fasten off leaving long tail for sewing
• Turn the hood inside-out
• Sew together the middle loops to complete the hood. Weave in all ends.

57 sts *Premium pattern has 2 images here*

Buttons & Edging

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Row 1

In this row work into the raw edge from the stomach area, up to the neck, round the hood and back down to the stomach area.

• Use yarn color A (black).
• Attach yarn to the bottom left of the centre split (1st round of hips)
• In the end of every row sc x 126 (130,134,138,142,146,150,154)
• ch x 1 & turn

126 sts (130,134,138,142,146,150,154) *Premium pattern has image here*

Row 2

• Change to yarn color B (white)
• sc x 126 (130,134,138,142,146,150,154)
• ch x 1 & turn

126 sts (130,134,138,142,146,150,154) *Premium pattern has image here*

Row 3

• sc x 8 (9,10,7,8,9,10,11)
• ch x 3 for 1st button loop
• *sc x 6 (6,6,7,7,7,7,7)
• ch x 3 for button loop*
• Repeat steps above between *’s 3 more times
• sc x 62 (64,66,68,70,72,74,76) around hood
• **sc x 1 & add a stitch marker
• sc x 5 (5,5,6,6,6,6,6)**
• Repeat steps above between **’s 3 more times
• sc x 1 & add a stitch marker
• sc x 7 (8,9,6,7,8,9,10)
• Fasten off leaving tail for sewing
• Tuck the last stitch under the first stitch and sew together.
• Replace stitch markers with buttons
• Weave in ends.

126 sts (130,134,138,142,146,150,154) *Premium pattern has image here*

Cat Ears

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Make 2 using yarn color A (black). Work in rounds and use stitch markers if you need to.

Round 1

• sc x 6 into a magic ring

6 sts

Round 2

• (2sc, sc x 2) 2 times

8 sts

Round 3

• (2sc, sc x 3) 2 times

10 sts

Round 4

• (2sc, sc x 4) 2 times

12 sts

Round 5

• (2sc, sc x 5) 2 times

14 sts

Round 6

• (2sc, sc x 6) 2 times

16 sts

Round 7

• (2sc, sc x 7) 2 times

18 sts

Round 8

• (2sc, sc x 8) 2 times

20 sts

Round 9

• (2sc, sc x 9) 2 times

22 sts

Round 10

• (2sc, sc x 10) 2 times

24 sts

Round 11

• (2sc, sc x 11) 2 times
• Press flat and sew bottom together.
• Sew ears onto the hood using the guide below as a reference.

26 sts *Premium pattern has image here*

Cat Tail

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Use yarn color A (black). Work in rounds and use stitch markers if you need to.

Round 1

• sc x 6 into a magic ring

6 sts

Round 2

• 2sc x 6

12 sts

Rounds 3 – 50 (51, 52, 53, 54, 55, 56, 57)

• sc x 12
• Fasten off. Lightly fill with toy stuffing. Sew onto onesie.

48 rows (49,50,51,52,53,54,55) *Premium pattern has image here*

Whiskers

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Use yarn color B (white). Sew some cat’s whiskers into either side of the hood. Use the guide below to help position your whiskers.

Published: May 16, 2025 | Last Updated: June 10, 2026