The best way to learn proper English is to read news report, and watch news on TV. Watching TV shows is a great way to learn casual English, slang words, understand culture reference and humor. If you have already watched these shows then you may recall the words used in the following dialogs.

Well, wear different PAJAMAS.
The Big Bang Theory Season 2, Episode 3

Do you need to borrow a toothbrush
or PAJAMAS?
The Big Bang Theory Season 8, Episode 20

Hey, lots of people wear matching PAJAMAS
who aren't dating.
The Big Bang Theory Season 8, Episode 8

...in the matching PAJAMAS she got them
because they both just love penguins.
The Big Bang Theory Season 8, Episode 8

(IN INDIAN ACCENT) I\'m a fancy
Indian man. We invented pajamas.
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(IN INDIAN ACCENT) I\'m a fancy
Indian man. We invented pajamas.
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(IN INDIAN ACCENT) I'm a fancy
Indian man. We invented PAJAMAS.
The Big Bang Theory Season 1, Episode 15