A button catch on a men’s dress shirt is a small, often hidden button (and corresponding loop or tab) designed to help keep parts of the shirt aligned and secure, particularly when worn with a tie or jacket. There are a few common uses for this term:

1.

Collar Button Catch (aka Hidden Button-Down)

• Where: Underneath the collar points.
• Purpose: Holds the collar in place so it doesn’t flap around. Gives a cleaner look without visible buttons.
• Style Note: Looks like a spread or point collar but with the practicality of a button-down. Often seen in more formal or business-casual shirts.

2.

Placket Button Catch

• Where: Near the bottom of the placket (the vertical fabric strip with the buttons).
• Purpose: Prevents gaping between buttons—especially helpful when sitting or if the shirt is snug.
• Style Note: Often found on well-tailored or high-quality dress shirts.

3.

Tab Collar Catch

• Where: Between the collar points, underneath the tie knot.
• Purpose: A small tab with a hidden button or snap that pulls the collar together tightly behind the tie knot for a sharp, elevated look.
• Style Note: Gives the tie a noticeable pop and is considered a sartorial detail with retro flair.

If you’re looking at a shirt labeled with a “button catch” and wondering what exactly it does, it’s probably referencing one of these subtle but purposeful additions meant to improve structure and style. Let me know if you saw this term in a specific shirt context—happy to narrow it down.