The phrase "knit suit 4-button" is likely a term used to describe a clothing item. This phrase is used to explain the features and style of a suit or jacket. Here are the basic terms explaining this phrase: Knit: Knit refers to knitted or woven fabric.

Knit fabrics, which usually have a soft and elastic texture, provide comfort and flexibility in clothing. Suit: A suit is a clothing unit typically consisting of a jacket and trousers combined in the same fabric and color. Suits are especially preferred for formal or business wear. 4-Button: The term "4-button" indicates the number of buttons on the front of the jacket.

This may vary depending on the style and design of the jacket. For example, a 4-button jacket is usually closed with buttons, but only the top two or top three buttons may be used.