Underneath It All: Sewing Knickers That Fit the Body You've Got

Underwear is one of those sewing projects that sounds faintly daring until you realise how little fabric it uses. A pair of knickers can be cut from a jersey offcut, a tired T-shirt or a remnant left over from a dress that never quite behaved. In Beccles, where plenty of us sew at the kitchen table and buy cloth in short bursts, that small scale is part of the appeal. This is not a quest for a perfect pattern-photo finish. It is a practical way to make a layer that sits where you want it, in a shape that suits the body you actually have.

Why knickers are a good first jersey project

Short seams, quick construction and very little fabric make knickers a friendly introduction to sewing stretch materials. You learn how jersey behaves without committing to a whole garment. You also get to solve fit problems that shop-bought underwear often ignores: waistbands that dig, leg openings that gape, a gusset that rides up, or fabric that rolls down after ten minutes.

There is a body-positive point here, but it is not preachy. Sewing your own knickers simply starts from measurements and fit notes rather than a size label or a changing-room mirror. You are not trying to squeeze into a standard shape. You are making a small, useful garment around the shape you already are.

Begin with a simple shape, then adapt it

Look for a basic brief pattern with three main pieces: front, back and gusset. Avoid lace panels, tiny bows and fiddly lingerie details for your first pair. A plain jersey brief is enough, and it will teach you more.

Make a toile in an old jersey before cutting into anything precious. Check the rise at the front and back, the leg opening and the waist height. If your measurements sit between two sizes, blend them rather than picking one and hoping. Take your hip measurement, your waist measurement and note where you want the waistband to sit. Those notes matter more than the number printed on the envelope.

The fabric question: stretch, recovery and a sensible gusset

For knickers you want jersey with good stretch and reasonable recovery. Cotton jersey with a little elastane is a good starting point: it breathes, feels familiar against the skin and holds its shape through wear. Avoid limp, tired jersey that has already gone thin at the elbows or seat. Stretch and recovery are doing a lot of the work here.

For the gusset, a cotton jersey or fine rib works well. It is worth washing and drying your fabric before cutting, because jersey can shrink and you do not want your first pair to become a mystery after the first laundry day.

Elastic matters too. Soft lingerie elastic around 8–10mm wide is easier to handle than narrow stuff that twists. Use polyester thread rather than old cotton thread, and a ballpoint or stretch needle in your machine. None of this needs to be expensive. It just needs to be sensible.

If you are sourcing locally, there are plenty of low-cost routes. Charity shops around Beccles, Bungay and Halesworth often have large cotton T-shirts that can be cut up for practice pairs or gussets. Market remnants and fabric swaps are good for jersey offcuts. For elastic, thread and needles, a proper haberdashery trip to Lowestoft or Norwich is worth saving up for, or you can add them to an online order. The point is not to buy a whole new stash. The point is to use what you have, plus a few small bits that make the project work.

Your no-drama kit

You do not need a dedicated lingerie studio. A basic sewing kit will do:

• A simple brief pattern in your size range
• Cotton jersey with some elastane for the main pair
• A small piece of cotton jersey for the gusset
• Soft lingerie elastic for waist and legs
• Polyester thread
• Ballpoint or stretch needle
• Pins or sewing clips
• Fabric scissors
• A sewing machine with a zigzag or stretch stitch, or an overlocker if you already have one

A sewing machine is ideal, but you can hand-sew a pair with a backstitch and a lot of patience. It is not the project to start on the night before you need it, though.

A beginner-friendly order of sewing

Start by cutting your pieces with the stretch running across the body, as your pattern instructs. Mark the front, back and gusset so you do not lose your place. If your pattern does not include seam allowance, add it before you cut.

Sew the gusset to the front and back pieces first, with right sides together, using a narrow zigzag or stretch stitch. Take it slowly. Jersey does not need to be stretched as you sew; let the machine feed it through and keep the seams even. Turn the gusset into place and topstitch if your pattern asks for it.

Next, sew the side seams. This is a good moment to baste first and try the knickers on over underwear. Check the rise and the leg line before you commit. If the legs feel loose, you can adjust the curve; if the waist sits too low, add a little height before you attach the elastic.

Finally, add the elastic. Measure around the waist and leg openings, then cut the elastic a little shorter than the opening — around 90% is a common starting point, but test it against your body. Join the elastic into a loop, divide it into quarters and pin it to the wrong side of the opening, matching quarter points. Sew with a zigzag, fold the elastic over and topstitch carefully. Do not pull the elastic hard as you sew; let the machine do the easing.

The first wear test and the tweaks that follow

Wear your first pair for an hour at home before you decide anything. Note where the waistband sits, whether the legs gape or dig, and whether the gusset feels wide enough. If the leg elastic is too loose, shorten it slightly next time. If the waistband rolls, try a firmer elastic or a slightly shorter length. If the rise is wrong, add or remove height at the waist on your pattern.

Keep these notes with your pattern. Your second pair will be better, and your third will probably be the one you reach for first. That is the quiet pleasure of sewing knickers: the improvements are small, personal and immediate.

Sourcing around Beccles without turning it into a quest

You do not need a specialist supplier to get started. A Saturday morning pootle around Beccles charity shops can turn up a large cotton jersey T-shirt for a practice pair. Market remnants can become gussets and test pieces. If you sew with friends, a fabric swap is a good way to move jersey offcuts along. Buy your elastic in one go, keep it in a tin, and you will be ready for the next pair without another shopping trip.

Making your own knickers will not fix the whole fashion industry, and it does not need to pretend otherwise. It is a small layer with a practical point: fewer ill-fitting pants, more fabric kept in use, and a better understanding of what fit actually means on your own body. Start with one pair. Then make another. Before long, the drawer will tell its own story.