How Korean Kids’ Clothing Sizes Work
Korean kidswear sizing can look confusing at first, especially if you are used to US, UK, EU, or Japanese size systems. Some Korean brands use height-based numbers, others use letter sizes such as S, M, and L, and some still use traditional numbered size systems.
There Is No Single Korean Kidswear Size System
One of the most important things to know is that Korean children’s clothing does not follow one universal sizing format.
Depending on the brand, you may see sizes such as:
- 90, 100, 110, 120, 130
- XS, S, M, L, XL
- 5, 7, 9, 11, 13
- age-based references such as 3–4 years or 5–6 years
This is why direct size conversion can sometimes be difficult.
A size marked “M” at one Korean brand may fit differently from an “M” at another.
Height-Based Sizes: 90, 100, 110 and Beyond
Many Korean children’s brands use numbers that roughly correspond to the child’s height in centimeters.
For example:
| Size | Approximate Height |
|---|---|
| 90 | around 90 cm |
| 100 | around 100 cm |
| 110 | around 110 cm |
| 120 | around 120 cm |
| 130 | around 130 cm |
| 140 | around 140 cm |
These numbers should be treated as a reference rather than an exact measurement.
The actual fit will depend on the garment’s pattern, silhouette, fabric, and the brand’s own sizing standards.
Letter Sizes: XS, S, M, L and XL
Some Korean brands, especially independent fashion labels, prefer letter sizes.
These may be combined with approximate age or height references.
For example, a brand may describe an M as suitable for children around 100 cm tall, while another brand may recommend the same M size for a slightly different height range.
The letter itself does not tell you everything.
Always check the brand’s individual size chart.
What About Korean Sizes 5, 7, 9, 11 and 13?
Traditional numbered sizes are also common in Korean kidswear.
You may see:
5 / 7 / 9 / 11 / 13
These numbers are not direct measurements in centimeters and should not be treated as universal international conversions.
They are part of a traditional Korean sizing convention, and the corresponding age or height can vary between manufacturers.
This is one reason international shoppers should avoid choosing a size based only on the number printed on the label.
Age Is Helpful, but Height Is Better
Age ranges can be useful as a quick reference, but children grow at very different rates.
Two children who are both five years old can have very different heights, builds, and proportions.
If possible, use the child’s actual height as your first reference.
After that, check the individual garment measurements.
Measurements Matter More for Certain Garments
Some styles allow more flexibility than others.
Oversized sweatshirts, loose trousers, bloomers, and overalls may still look good when worn slightly larger.
More fitted garments, short-length pieces, or clothing made from fabrics with little stretch require more careful measurement.
When shopping online, it is useful to compare:
- total length
- chest width
- waist
- rise
- inseam
- sleeve length
with a garment your child already owns and wears comfortably.
Korean Kidswear Often Uses Different Proportions
Sizing is not only about body measurements.
Many Korean kidswear brands intentionally use distinctive proportions such as:
- dropped shoulders
- wide bodies
- cropped lengths
- oversized tops
- voluminous trousers
- loose overalls
This can make a garment look much larger on a flat measurement chart than it actually feels when worn.
Sometimes that extra volume is simply part of the intended design.
Should You Size Up?
Not automatically.
It is common to size up for growing children, but a garment that is already designed to be oversized may become too large if you choose an extra size.
A better approach is:
- Check the child’s height.
- Look at the brand’s recommended size.
- Check the garment measurements.
- Consider the intended silhouette.
- Size up only if you prefer extra room or longer wear.
A Note for International Shoppers
When buying Korean kidswear from overseas, it is usually better not to rely on a direct US-to-Korea or EU-to-Korea size conversion.
Instead, start with:
height → brand size chart → garment measurements
This method is much more reliable than trying to convert one country’s label directly into another.
Final Tip
Korean kidswear sizing may look complicated at first, but the basic rule is simple:
Do not shop by the label alone.
Use height as your starting point, check the measurements, and pay attention to how the garment was designed to fit.
Once you get used to that process, Korean kidswear sizing becomes much easier to understand.
