Children’s underwear patterns

Children’s underwear patterns: sewing underwear that really stays in place

Poorly cut underwear is immediately noticeable on a child: knickers that dig into the hips, boxer shorts that ride up with every step, elastic that leaves red marks after a day at school. Pattern-making solves these problems, which off-the-peg underwear – mass-produced to fit standardised body shapes – cannot anticipate. A 6-year-old might have the hips of a 4-year-old and the waist of an 8-year-old. The PDF pattern, adjusted to their actual measurements, sorts this out in 30 minutes of sewing.

Choosing the right fabric before cutting

Cotton jersey with 5–8% elastane is the go-to fabric for children’s underwear. It withstands washing at 40°C, doesn’t pill after 50 machine washes and remains soft against the skin all day long. Avoid jerseys that are too thin (less than 150 g/m²): they become see-through and don’t hold the elastic well. Bamboo jersey is a good alternative for children with sensitive skin, but it costs around two to three times as much as standard cotton and needs to be washed at 30 °C to prevent shrinkage.

For finishing touches, 1.5 cm flat elastic is the standard width for children’s knickers and boxers. It stays in place without pinching if you fit it with a slight tension, never flat. An elastic band that’s too tight is the main cause of marks on children’s tummies by the end of the day.

Knickers, boxers, shorts: which children’s underwear pattern to choose

Classic knickers are suitable for girls aged 2 to 10 and can be sewn in under an hour once you’ve got the hang of the pattern. Long boxer shorts, such as cycling shorts, are often preferred by active boys: they don’t ride up during play and offer greater freedom of movement around the hips. For younger children (18 months to 3 years), styles with a wide gusset and soft elasticated waistband make it easy to slip the underwear on without straining on legs that don’t always cooperate.

Most of the patterns in this collection cover sizes 2 to 12 years, and in some cases up to 14 years. Take the child’s waist and hip measurements rather than relying on their age: the difference in hip measurement between two 6-year-olds can be as much as 4 to 5 cm.

Sewing techniques for children’s underwear made from stretch jersey

An overlocker isn’t essential, but it speeds up the finishing of the edges and gives a neater result. Without an overlocker, use a zigzag stitch with a No. 75 ball-point needle suitable for stretch fabrics. A standard needle will pierce the jersey rather than stretch it, causing invisible but very real micro-tears. Polyester thread is preferable to cotton for seams on jersey: it stretches slightly with the fabric rather than snapping.

To attach the waistband elastic, divide it into four equal parts and do the same with the fabric. Pin the centre front, centre back, and right and left sides: this prevents you from ending up with excess elastic on one side after going all the way round.

How much does a pattern for homemade children’s knickers cost?

A PDF pattern costs between €5 and €12, and can be used as many times as you like. For a pair of knickers, you’ll need 20 to 30 cm of jersey, depending on the child’s size, and 30 cm of flat elastic. At €12 per metre for standard cotton jersey and €1 per roll of elastic, each pair costs less than €2. For a family with two children, a good pattern pays for itself by the fifth or sixth pair you sew.

First sewing project for children or teenage beginners

Children’s underwear is often one of the first projects suggested in sewing workshops for teenagers. A simple pair of knickers requires only three or four pieces to be sewn together, with no complex hems, and any mistakes are easy to correct. A child aged 10 to 12 who is confident using a sewing machine can make their first pair of knickers in 45 minutes using a well-explained pattern. It’s a quick, practical project, and technical enough to be rewarding.

Complete the handmade wardrobe with other children’s PDF patterns

Hand-sewn underwear pairs naturally with other homemade garments. For nights, the children’s pyjama patterns use the same cotton jersey fabrics and the same elastic-seaming techniques. For bottoms, the children’s trousers patterns complete everyday outfits, from dungarees to jogging bottoms. Seamstresses who also make clothes for themselves will find the same technical basics in the women’s underwear and lingerie collection.

The designers featured in the shop publish patterns that have been tested by their community, with instructions tailored to seamstresses who do not sew full-time. Klafoutis is known for its highly detailed children’s patterns with well-documented size variations. Lilikou offers several styles of children’s jersey underwear with ribbed trims. Le Papa de Jojo stands out for its instructions designed for self-taught seamstresses, without unnecessary jargon.