Pajamas and pyjamas refer to exactly the same garment — the difference is purely geographical.
Pajamas is the standard spelling in American and Canadian English, while pyjamas is preferred in British, Australian, and most Commonwealth English. Neither is wrong — your audience determines which to use.
This guide breaks down the difference between pajamas and pyjamas, where each spelling comes from, and how to choose the right one for your writing.
What Are Pajamas / Pyjamas?
Both spellings refer to the same thing — loose, comfortable garments worn for sleeping or lounging, typically consisting of a top and drawstring trousers. The word covers everything from simple cotton sleepwear to elaborate silk lounging suits.
Example: “She changed into her pajamas and settled in for a quiet evening.” “He wore his pyjamas all morning on weekends — unapologetically.”
Common Uses of Pajamas / Pyjamas
Common nicknames: PJs, jammies, jim-jams (British), jam-jams
Where Did the Word Come From?
The word traces back to Hindi and Persian origins — from the Persian pāy-jāma (also written pā’ejāma) meaning “leg garment” or “leg clothing.” The word pāy means “leg” and jāma means “garment.”
British colonists encountered these loose-fitting trousers in South Asia and brought both the garment and the word back to Britain. The British adopted the spelling pyjamas — fairly close to the original Persian phonetic rendering.
When the garment became popular in the United States, the spelling naturally shifted to pajamas — following the broader American English tendency to simplify or Americanize spellings that had come through British colonialism.
Pajamas vs Pyjamas — The Regional Difference
The Memory Trick
Pajamas has an A — like America. Connect the a in pajamas to the A in American and you will always know which spelling belongs where.
Pyjamas has a y — and so does the United Kingdom… well, not quite, but pyjamas is the British spelling, and British spelling tends to preserve older letter patterns that American English simplified.
How Each Spelling Developed
British English preserved the y from the original transcription of the Persian/Hindi word — maintaining a spelling closer to how the word arrived in the English language through colonial contact.
American English simplified it to pajamas — following the same broad pattern that produced other American vs British spelling differences:
The y → a shift in pajamas fits naturally into the American tradition of streamlining spelling without changing pronunciation.
Which Spelling Should You Use?
The answer depends entirely on your audience and context:
The golden rule: Pick the spelling that matches your audience — and stay consistent throughout your document. Switching between pajamas and pyjamas in the same piece of writing creates inconsistency, even though both are correct.
Common Mistakes to Avoid
PJs — The Universal Shorthand
One of the beauties of this spelling debate is that the abbreviation PJs sidesteps it entirely. PJs is universally understood in all English-speaking countries — American, British, Australian, and beyond — making it the most practical informal shorthand when you want to avoid the spelling question altogether.
“I was still in my PJs when they knocked on the door.” — understood everywhere, spelled the same everywhere.
FAQs — Pajamas vs Pyjamas
Which is correct — pajamas or pyjamas?
Both are correct — in different regions. Pajamas is the American and Canadian standard. Pyjamas is the British, Australian, and Commonwealth standard. Neither spelling is a misspelling — they are regional variants of the same word with the same meaning.
Are you meant to wear undies under PJs?
This is entirely a matter of personal preference and comfort. There is no universal rule — some people do, some do not, and both choices are completely acceptable. What matters most is what feels comfortable to you.
Why do Americans say “pajamas”?
Americans spell and say “pajamas” because American English simplified the spelling from the British “pyjamas” — following a broader pattern of spelling reform in American English that replaced certain British spellings with more phonetically streamlined alternatives. The pronunciation is nearly identical in both varieties.
What do the British call pajamas?
The British call them pyjamas — the same garment, spelled with a y instead of an a. Informally, British speakers also use PJs, jammies, and the particularly British jim-jams to refer to sleepwear.
Conclusion
Pajamas and pyjamas are two spellings of the same word — different in their second vowel, identical in everything else. Pajamas belongs in American and Canadian English. Pyjamas belongs in British, Australian, and Commonwealth English.
The word itself traces back to the Persian pāy-jāma — a “leg garment” that traveled from South Asia to Britain and eventually to the world. Choose the spelling that matches your audience, stay consistent, and never worry about one being more correct than the other — because both are perfectly right in their respective homes.
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