Two languages, one sentence
A second line in another script isn't decoration — it's the same thing said twice, and it changes who the shirt is for. The typography needs handling, and so does the translation.

Two lines, one meaning. The English states it and the Chinese states it again, set slightly larger, directly beneath.
That's a different object from a shirt with foreign characters used as texture, and it's worth being clear which one you're making — because one of them is a sentence and the other is a pattern.
Why put the same thing twice?
Because the doubling is the content.
A bilingual line says the idea exists in more than one place, and that the wearer belongs to more than one. For people who grew up between languages, that's not a graphic device — it's an accurate description of how a thought arrives, in one language and then the other.
It also changes the audience. A single-language shirt is read by everyone who reads that language. A bilingual one is read twice by some people, once by most, and recognised by the group who can do both — which is a much more specific signal than either line alone.
What's the difference from using characters decoratively?
Whether the second line means anything, and whether you know what it means.
Foreign script as texture has a long history in fashion and it isn't going anywhere. But the failure mode is famous and permanent: a garment worn in public carrying a sentence the wearer can't read, which turns out to say something they'd never have chosen.
The rule is simple and worth stating plainly: know what it says. If the second line is a translation of the first, that's checkable. If it was chosen because it looked good, it isn't. The same discipline applies to any text on a shirt, and the stakes are just higher when you can't proofread it yourself.
Is a literal translation the right one?
Often not, and this is the part people underestimate.
Idioms don't survive being translated word for word, and a proverb that lands in one language can read as a fortune-cookie line in the other. The two lines don't need to be word-identical — they need to be the same sentence, which sometimes means using the existing proverb in each language rather than translating either.
Someone who reads both should be able to look at it and think yes, that's the same thing. That's the only real test, and it needs an actual bilingual reader rather than a tool.
How should the two scripts be sized?
Not the same. This is the most consistent technical mistake in bilingual layout.
Set Latin and CJK at the same point size and the Latin looks too small — CJK characters fill their em box far more completely, so the Latin needs scaling up to look balanced. What you're matching isn't the measurement, it's the apparent weight and darkness of each line on the garment.
Two more that matter on a shirt specifically:
- Match the average weight, not the stroke thickness. A dense character with many strokes reads darker than a light Latin face even when the strokes look similar.
- The CJK line needs more air. It wants a larger line height than Latin does, and cramping the two lines is what makes a bilingual print look patched together.
Which typefaces go together?
Ones with matching modulation, not matching names.
A high-contrast Latin serif pairs with a Ming/Song-style face because both have thick-thin modulation and a similar formality. A grotesque pairs with a Hei/Gothic face for the same reason. Mixing across — a geometric sans over a brush-style character — reads as two designs sharing a shirt.
The pairing on the shirt above is doing this: a serif with real contrast over a Ming face, so both lines look like they came from the same drawer.
Should it be stacked or side by side?
Stacked, almost always, with the primary language first.
Stacked reads as a translation. Side by side reads as a label — the way packaging or signage does — which is a legitimate but colder effect. And vertical setting is available for CJK and can be striking, but on a chest print it competes with the horizontal line rather than complementing it.
Which language goes on top is a real decision: it's the one the shirt is primarily in, and the second line is the echo.
What if the two languages aren't Latin and Chinese?
The principles hold, the specifics change.
Arabic and Hebrew run right to left, which changes alignment and where the eye starts. Devanagari hangs from a headline rather than sitting on a baseline. Cyrillic and Greek pair with Latin easily because the letterform traditions are shared.
What doesn't change: apparent weight over measured size, more air for the denser script, and a reader who can check both lines before it's printed.
How do I get one made?
Give both lines at JustOG — the exact wording in each language, and which one leads. Pick a direction, drag the crop frame, see it composited on the real garment, and it's made to order and shipped.
Designs other people have published are in the shop.
The second line isn't a decoration. Somebody is going to read it.