UNIQLO Bra Size Chart: US, UK, Japan & CM Conversion Guide

How UNIQLO Bra Sizing Works

A conventional bra label such as 34C describes one band and one cup. UNIQLO’s wireless range often works differently. Because a flexible molded cup can adapt across a small range, the brand may combine two bands and two cup letters into one retail size. That is why shoppers see labels such as 65/70 AB, 75/80 CD, 34/36 BC or 38/40 D DD.

The combined label does not mean that all four traditional sizes are identical. It means the product was designed as a shared starting size for several nearby measurements. A 75C and an 80D still differ in both band and cup volume; they simply fall inside the same regional UNIQLO cup-and-band block for that particular wireless design.

This is also why a generic “UNIQLO bra size conversion” can become confusing. There are three layers to identify before buying:

1. The product family: 3D Hold commonly uses grouped band-and-cup labels, while Relaxed or lace styles may use alpha sizes.
2. The country storefront: US labels use inch-style bands such as 34/36; Asian and metric storefronts commonly show 75/80.
3. Your exact size inside the group: 75C and 75D may sit together on one regional chart but move into different groups on another country’s chart.

UNIQLO Wireless Bra 3D Hold Size Chart — US Labels

The current US chart groups two adjacent band sizes and neighboring cups. For example, UNIQLO’s official guide says that a 34B should start with 34/36 BC. The full practical chart below makes the grouped ranges easier to scan.

The word approximately matters in the fuller cup rows because US, UK, EU and Japanese cup letters stop matching one-for-one after D. A band conversion can be direct—75 roughly corresponds to 34—but cup letters must be translated by system rather than copied blindly. Use the Global Bra Size Converter when your normal size is DD or above.

UNIQLO Bra Size Chart in CM

On metric UNIQLO storefronts, the 3D Hold range may be labeled with band pairs 65/70, 75/80 and 85/90, combined with cup groups such as AA, AB, CD and EF. These numbers are not the literal garment circumference. They are conventional metric bra bands associated with underbust measurement ranges.

Metric band conversion at a glance

75/80 Bra Size at UNIQLO: What Each Part Means

The label 75/80 is a shared band range. In standard international conversion, 75 aligns with a 34 band and 80 aligns with a 36 band. When the label adds CD, the cup block includes C and D. That produces four conventional starting sizes: 75C, 75D, 80C and 80D.

Which one should you buy if your tag says 75/80 CD?

Start by recalling which exact size originally led to that grouped label. If your best regular bra is 34C, choose the current US group containing 34C. If your best regular bra is 36D, choose the group containing 36D. When you do not know your exact size, re-measure rather than guessing from the old UNIQLO label. The Bra Size Calculator gives a current baseline, and the Brand Size Decoder helps you compare the result with other stores.

UNIQLO Bra Size Chart: Japan to US and UK

UNIQLO began in Japan, but the label shown online depends on the market. A metric chart may show 65, 70, 75, 80, 85 and 90, while the US chart shows 30, 32, 34, 36, 38 and 40. UK bands normally use the same numbers as US bands, so the band conversion is straightforward.

Cup conversion needs more care. A, B, C and D are usually readable across the common charts used for these UNIQLO wireless ranges, but DD, DDD, E, F and G do not have identical meanings in every system. A US DD is commonly UK DD but does not simply become EU or Japanese DD. When your usual size is above D, convert through a full system chart and then locate the result inside the specific UNIQLO product block.

UNIQLO Wireless Bra Relaxed Size Chart

UNIQLO Wireless Bra Relaxed and some stretch-lace versions use clothing-style sizes rather than a grouped 34/36 BC label. The chart still begins with your band-and-cup size, but the final product choice is XXS, XS, S, M, L, XL or, for some products and markets, XXL.

Alpha-sized wireless bras are forgiving, but they ask one garment to serve several body proportions. Someone at the small-band, fuller-cup edge of a size may experience a loose underband before the cup feels roomy enough. Someone at the larger-band, smaller-cup edge may find the cup too tall or the neckline too open. This is not proof that your measured bra size is wrong; it may simply be the limitation of an alpha-sized style.

3D Hold vs Relaxed: which chart should you use?

How to Measure for a UNIQLO Bra

UNIQLO’s own regional guides begin with top-bust and underbust measurements. Taking both measurements is useful even when you already know a size, because wireless bras can hide a changing fit longer than structured underwired styles.

For a more detailed measuring walkthrough, use our Bra Band Size Guide and Cup Size Measurement Guide. They help separate a band problem from a cup problem before you select a UNIQLO group.

UNIQLO Bra Fit Problems and the Best Next Size

A grouped wireless size can feel comfortable at first while still fitting poorly. Soft fabric reduces obvious pressure, but it does not remove the need for a stable band, contained breast tissue and straps that carry only a minority of the support.

Should you use a sister size?

Sister sizes keep roughly the same cup volume while changing the band. A 34D and 36C are sister sizes; 34C and 36C are not. A grouped label may contain both sister and non-sister sizes, so the label itself is not a sister-size chain.

Use sister sizing when the cups fit but the band does not. For example, if 34D cup volume is right but the band feels too firm, 36C is the looser-band sister size. The Sister Size Calculator can generate the correct alternatives without random cup changes.

Why the UNIQLO Bra Sizing Chart Changes by Country

UNIQLO regional stores do not always display the same label format, cup sequence or product inventory. The US 3D Hold chart groups conventional sizes into labels such as 34/36 BC and 34/36 D DD. A metric Asian chart may group the nearby range as 75/80 AB, 75/80 CD and 75/80 EF. Meanwhile, Relaxed bras may be sold in letters from XS to XXL.

These differences are not necessarily contradictions. They reflect regional size notation, product revisions and the way each market presents the adaptive cup range. The mistake happens when a shopper sees a familiar band pair and assumes the cup block is identical across regions.

Before ordering from another country’s UNIQLO store

• Write down your exact conventional size, not only your old grouped UNIQLO label.
• Confirm whether the product is 3D Hold, Relaxed, Active, stretch lace or a bra top.
• Use the chart attached to that exact product page and country storefront.
• Check whether online-only sizes are available in your target market.
• Review the local return or exchange policy before removing tags.
• When the converted size sits at the edge of a group, compare both neighboring groups if returns are practical.

For broader regional conversions, the Bra Sizes by Country hub provides dedicated calculators, including the Japan Bra Size Calculator, US Bra Size Calculator and EU Bra Size Calculator.

What the Chart Cannot Tell You

A chart can tell you which label contains your starting size. It cannot see breast shape, root width, tissue softness, asymmetry, shoulder slope or how firmly you prefer the band to feel. Two people who both wear 34C may react differently to the same molded wireless cup: one may fill the upper edge smoothly, while the other sees a gap because her fullness sits lower.

UNIQLO’s adaptive wireless cups are convenient for everyday wear, travel and smooth clothing, but a broad size block always involves compromise. Shallow shapes may appreciate the molded profile. More projected shapes may need extra cup depth even when the chart says the size is correct. Close-set breasts may notice pressure at the center, while wide-set breasts may prefer a wider cup base.

Use the chart as a disciplined starting point rather than a verdict. Put the bra on correctly, scoop breast tissue from the sides into the cups, adjust the straps, and wear it for several minutes. Then evaluate the band, cup edge, side coverage and movement separately. Our Best Bra Types for Every Breast Shape guide can help when the converted size is close but the style still feels wrong.

Continue Your Fit Check