Button-down (adjective)

1. A garment, typically a shirt, with buttons that fasten the front of the collar or cuffs.
2. A style of collar that is fastened with buttons.

Origin:

From button (a small fastener) + down (in reference to the position of the buttons on the garment).

Examples:

1. He wore a button-down shirt to the interview.
2. The button-down shirt was a classic and versatile piece of clothing.
3. The button-down collar was a popular feature of men's dress shirts.
4. He always wore button-down shirts to work, it was his signature style.
5. The button-down shirt is a must-have in any man's wardrobe.