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.

My Valentine's Day OUTFIT.
The Big Bang Theory Season 12, Episode 24

...that my brother has that OUTFIT
in his wardrobe. Can we not discuss it?
The Big Bang Theory Season 4, Episode 18

Over here, the fencing OUTFIT.
The Big Bang Theory Season 12, Episode 24

to ask you to look at the
OUTFIT I'm going to wear?
The Big Bang Theory Season 5, Episode 6

and thought maybe you could
help me pick out an OUTFIT?
The Big Bang Theory Season 11, Episode 10