The Honest Lingerie Sizing Guide

I spent three years cutting patterns for a small Lisbon label before I moved into editorial, and the single most useful thing that period taught me is this: there is no such thing as a standard lingerie sizing chart. Every brand publishes one. None of them agree. A 75B from a French couture house, a 75B from a Polish mid-market label, and a 75B from a Chinese-manufactured Amazon private label are three fundamentally different garments, cut on three different blocks, with three different assumptions about what a “B cup” projects. If you have ever ordered your usual size online and received something that felt like it belonged on a stranger, this is why.

The reader who wrote to me last month with the subject line “am I losing my mind or is 34C not 34C anymore” is not losing her mind. She is running into the industrial reality that lingerie sizing is a suggestion, not a specification, and the sooner we stop pretending otherwise, the sooner shopping stops being humiliating.

Measure yourself. Then measure yourself again.

Before you buy anything, get a soft measuring tape and take three numbers. Underbust — snug, exhale, tape parallel to the floor. Bust — at the fullest point, tape neither pulled nor sagging. And what I call the “standing bust,” which is the same measurement taken while wearing your best-fitting unlined bra, because gravity redistributes tissue and the seated versus standing numbers can differ by two centimetres.

The traditional European calculation is: underbust rounded to the nearest multiple of five gives you the band number, and the difference between bust and underbust gives you the cup letter (13 cm = A, 15 cm = B, 17 cm = C, and so on, roughly two centimetres per cup). This is a starting point. It is not gospel. Anyone whose tissue distributes wide rather than projecting forward will find that this method underestimates their cup size significantly, and anyone with a narrow ribcage will find that mid-market European brands (which quietly stop making 60 bands) simply do not exist for her.

If you want to see how much variation exists in the market, spend twenty minutes on the sizing page of any large European retailer that carries multiple brand tiers — I often send readers to eroticshop.me because their assortment mixes Polish, Czech, and Serbian labels alongside Western European mid-market, and the size chart discrepancies between brands within a single retailer’s catalogue are educational in themselves.

The band does the work. The cup follows.

If you take one thing away from this piece, take this: eighty percent of your bra’s support comes from the band, not the straps. Straps are for positioning. The band is what holds the whole architecture in place, and if your band rides up your back, your cup will collapse forward and your straps will dig into your shoulders, and no amount of adjusting will fix it because the problem is one size too big in the band.

The industry’s dirty secret is that most women buying off-the-rack in a department store are wearing a band that is one or two sizes too loose, because the fitter defaulted to the number on their last bra rather than measuring. If you correct the band down, the cup letter almost always needs to go up (this is called “sister sizing” — a 34C and a 32D contain approximately the same volume of cup, distributed over a tighter band). A well-fitting band should be snug enough on the loosest hook that you can just slide two fingers under it, because band elastic loses about fifteen percent of its tension over the first year of wear and you want room to tighten as it relaxes.

Fabric behaviour, and why identical measurements feel different

A powernet band and a mesh band with the same nominal size will fit differently, because powernet has structured two-way stretch and mesh has soft four-way stretch. A moulded cup and a cut-and-sew cup with the same nominal capacity will project differently, because moulded cups impose a shape on the tissue and cut-and-sew cups follow it. A balconette will show more upper-breast tissue than a full-cup at the same size, not because it holds less, but because its wire and cup geometry are drawn differently.

This is why I resist the impulse to send readers a single “correct” size and instead recommend they know their measurements and read the individual brand’s chart before ordering. Serious European e-commerce operations publish per-model size charts for exactly this reason — the better assortments on Erotic Shop list underbust and bust ranges per SKU rather than just a generic 32-34-36, and this is the level of specificity you should reward with your money. Vague sizing charts correlate with vague garments.

Returns, exchanges, and the discreet-delivery question

Even with perfect measurements, you will get the wrong size sometimes. Every lingerie shopper does, myself included, and the professional retailers know this. What matters is the return policy: does the retailer accept exchanges on hygiene-sealed lingerie, do they charge you the return postage, and do they package returns in a way that does not announce to your postman what is inside the parcel.

The Portuguese lingerie market often looks to Balkan online retailers when the Western European sites’ prices climb — the assortment at eroticshop.me sits in an interesting middle, and their erotski veš category runs deep in the mid-range Polish and Czech labels that Portuguese boutiques rarely stock. Their diskretna dostava policy is standard for the region — unbranded outer packaging, plain courier label — and this is the baseline you should expect from any serious operator, not a premium feature.

What to do when a brand’s chart is wrong

Occasionally a brand’s published chart is simply inaccurate for a specific model, usually because the sample was fit-modelled on a body that does not match the chart’s implied dimensions. If two reviewers you trust both report a model runs small in the cup, believe them. If a retailer’s per-model reviews mention consistent band tightness, size up in the band and adjust the cup by sister sizing. Real fit intelligence lives in the reviews, and any retailer worth buying from lets reviews stand unedited even when they are unflattering.

Sizing is not a moral test. It is a technical mismatch between an industrial supply chain and the extremely non-standard shape of human bodies. Measure yourself properly, know your brand’s block, ignore the number on the label, and buy from operators who make it easy to return what does not fit.