What a size chart can and cannot tell you

There is no legal definition of a size 8. There is no standard body it refers to, no authority that checks it, and no obligation on anybody to make one brand's 8 match another's. Every chart you have ever read was somebody's decision.

That sounds like a reason to give up. It is not. Once you know what a chart is actually made of, four measurements and one line on the label get you to the right size more often than trying things on in a badly lit changing room.

We sell a lot of clothes online, so this matters to us in a self-interested way: a return costs everybody time. What follows is what we would tell a friend.

The four measurements that decide everything

Take these once, write them on your phone, and never take them again until your body changes. Four minutes, one soft tape, no mirror needed.

1. Bust. Around the fullest part, tape level all the way round, arms down. Do not pull it tight. A finger should slide under the tape.
2. Underbust. Directly under the bust, snug. This is the number that decides whether a corset top or a bandeau will stay up, and almost nobody has it written down.
3. Waist. The narrowest part of your torso, usually an inch above the navel. Breathe out normally first, do not hold it in.
4. Hip. Around the fullest part, usually seven to nine inches below the waist. Feet together.

Two optional extras earn their keep. Inseam, from crotch to ankle bone, settles trousers. Shoulder to hem on a top you already love settles length, which is the thing photographs lie about most.

Stretch is the whole game

Two pieces with identical measurements fit completely differently if one stretches and one does not. This is the single biggest cause of an ordered size being wrong, and it is solvable by reading one line.

Fibre content has to be published, and there is a federal rule about how. The Textile Fiber Products Identification Act rules are specific about which fibres get named.

In practice that means a label reading 95% polyester, 5% elastane tells you the piece stretches and will pull back. A label reading 100% cotton or 100% polyester with no elastane tells you it will not. Five percent elastane is roughly the line between a garment that gives and one that does not, and the piece on what each fabric really does goes further into why.

The rule that follows from it

• Rigid fabric, no elastane: order the size whose chart measurement is larger than yours. Cloth does not grow.
• Stretch fabric, four to six percent elastane: order your usual size. It will give an inch and pull back.
• Heavy stretch, ribbed knit and swim fabric: consider sizing down if you want it close, because these can grow half a size with wear.

Where charts go wrong, and how to spot it

Scaled patterns

The cheapest way to make a size range is to draw one pattern and multiply it. It works up to a point and then it does not: a body two sizes larger is not the same shape scaled up, it is a different shape. Sleeves get tight before the waist does, and armholes get shallow.

The tell is a chart where every measurement increases by exactly the same amount at every step. Real grading changes step size as it goes. Plus pieces in our range are cut from their own patterns rather than scaled, which is worth exactly as much as it sounds and no more.

One number for a two piece

A set is sold as one size, and your top half and bottom half do not have to agree. There is no clever answer here: order to whichever half is larger and accept that the other half will be roomy, or buy the two pieces separately from tops and bottoms instead of from sets and outfits.

Vanity sizing drift

Sizes have grown over the decades while the numbers stayed the same. That is why a vintage 12 fits like a modern 8 and why the number on a label tells you almost nothing across brands. Measurements travel. Numbers do not.

How our range is graded

Two things in that table are worth reading slowly. The middle column is the honest one: where a maker does not publish a measurement, we print nothing rather than a guess. And the plus column is not a marketing number, it is a count of pieces cut on plus patterns.

Between sizes: a decision tree that fits on a napkin

1. Does the label list elastane? If no, size up. If yes, continue.
2. Is it a set or a jumpsuit? If yes, size to your larger half. If no, continue.
3. Do you want it close or comfortable? Close, keep your size. Comfortable, size up.
4. Is it ribbed, swim or heavy knit? If yes and you want it close, size down one.

That covers nearly everything. The exception is outerwear, where the question is not your body but what goes under it: a blazer over a hoodie needs a size more than a blazer over a cami.

The sizes nobody charts

Three measurements decide more outfits than the four on any chart, and almost nobody publishes them.

Arm circumference decides whether a fitted long sleeve is comfortable or a tourniquet. Rise, the distance from crotch seam to waistband, decides whether low-rise jeans sit where you expect or three inches lower. Strap drop on a cami decides whether the neckline lands where the photograph promised.

Where a maker publishes any of the three, we put it on the card. Where nobody publishes it, the honest move is to measure a garment you own and compare, which takes a minute and beats every guess.

What the care label adds

The other line worth reading before you order is the care instruction, because it tells you whether the piece will still be your size after a wash. Care information is regulated, and the rule is strict about whoever prints a care claim having a basis for it.

A piece that says cold wash only is telling you it will shrink in warm water. A piece that says do not tumble dry is telling you the dryer will take it down a size. Those are not suggestions, they are the manufacturer stating the limits of their own product.

What a photograph will not tell you

Every product photograph is a fitting on somebody else. Three things get hidden in the process, and all three are checkable before you order.

Where it actually ends

A cropped top on a tall model sits at the waist. The same piece on somebody eight inches shorter sits at the ribs. Length from shoulder to hem, measured on a garment you own, settles this in ten seconds and no photograph ever will.

Whether it is pinned

Studio shots are often pinned at the back to make a piece hang cleanly. It is normal and it is not dishonest, but it means the drape you are looking at is a size smaller than the one on the label. Photographs that show the back of a garment are the ones to trust on fit.

How heavy the fabric is

Weight decides whether a piece skims or clings, and a picture flattens it entirely. A rule that works: if you can see the model through a raised arm, the fabric is light. If the hem holds a shape when she moves, it is not.

Returns without drama

Ordering two sizes is not cheating. It is what fitting rooms used to be for, and with a range this size it is often the fastest way to learn how a department runs on your body.

Do it once per department rather than once per piece. Tops, bottoms and dresses each grade differently, so one calibration order in each teaches you more than five scattered ones.

Keep everything with tags on until you have tried it with the shoes and the layer you would actually wear. A skirt that seems too short over bare legs reads completely differently over tights, and half of what goes back would not have to.

Payment, delivery and returns happen at checkout with our retail partner rather than with us, so their window is the one that counts. It is worth checking before you order two sizes, not after.

Two habits that make online sizing work

First, keep a garment you already love and measure it flat. Chest across, length from shoulder, waist across. Those three numbers compared against a chart beat any amount of squinting at a photograph.

Second, when a piece works, write down which size in which department. Fit is consistent within a brand far more than it is across brands, and after three orders you stop guessing entirely.

The size ladder on our home page exists for the same reason. It lets you see every silhouette we make in one table, so you can find the shape first and worry about the number second.