An outfit is the clothes someone wears at a particular time.
When people talk about an outfit, they usually mean the combination of clothes that make up what someone is wearing, like a shirt, pants, dress, or coat. It's not just individual pieces of clothing, but everything together from head to toe. Think about it: when you're getting ready in the morning, you probably pick out your top and bottom separately, but then they become part of an outfit once you put them on together. If someone asks you what you wore yesterday, they want to know the whole combination, not just one item.
A set of clothing (with accessories).
Example: She wore a fashionable outfit with matching purse and shoes.
To provide with, usually for a specific purpose.
Example: The expedition was outfitted with proper clothing, food, and other necessities.
